{"title":"Grade 1 Math: Number \u0026 Operations in Base Ten","description":"\u003cp\u003e1st grade math worksheets and activities for number \u0026amp; operations in base ten (Common Core 1.NBT): printable mystery worksheets, CSI cases and digital escape rooms.\u003c\/p\u003e","products":[{"product_id":"2-digit-addition-no-regrouping-mystery-detective-worksheets","title":"2-Digit Addition Without Regrouping | Mystery Detective Worksheets | Grades 1–3 | Printable Detective Pack","description":"\u003cp\u003e2 digit addition with no regrouping worksheets for 1st grade and 2nd grade: five short math sheets, each a Mystery Detective page for the first half of the year. Print and go with full answer keys: no prep math activities for morning work, math centers, early finishers, homework and sub plans. Short pages of 2 digit addition without regrouping for 1st grade and 2nd grade, set around school, that a six year old can finish and feel good about. They suit math centers, morning work and early finishers in the first half of the year, with a CSI Mini Mystery Detective story on every page.\u003c\/p\u003e\n\n\u003cp\u003eThe first half of first grade is where addition without carrying gets its practice, and a missing toy to find is what makes the practice worth doing for a six year old. Every total takes a clue off the list, so they finish the page to learn who did it, and one case fits a morning work slot. Each CSI Mini Mystery Detective math page is self-marking, with an answer key included.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eThe Cases\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003col\u003e\n  \u003cli\u003e\n\u003cstrong\u003eThe Missing Toy\u003c\/strong\u003e - a classmate's toy has gone\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eMystery Present\u003c\/strong\u003e - a gift with no name on it\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eThe Missing Fruit\u003c\/strong\u003e - someone took the lunchbox fruit\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eThe Missing Student\u003c\/strong\u003e - one child is absent, nobody knows who\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eGotcha\u003c\/strong\u003e - a student caught doing the right thing\u003c\/li\u003e\n\u003c\/ol\u003e\n\n\u003cp\u003e\u003cstrong\u003eWhat's Inside\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cul\u003e\n  \u003cli\u003eFive case files, each one page of 2 digit addition with no regrouping\u003c\/li\u003e\n  \u003cli\u003eSixteen sums on every case, with every total under 100\u003c\/li\u003e\n  \u003cli\u003eFour clue lists on each page, so the class names the who, the where, the when and the what\u003c\/li\u003e\n  \u003cli\u003eA black and white copy of all five cases for everyday printing\u003c\/li\u003e\n  \u003cli\u003eAn answer key for every case\u003c\/li\u003e\n  \u003cli\u003ePrint and go: nothing to cut, laminate or set up\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003e\u003cstrong\u003eWhat Is a CSI Mini Mystery Detective?\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cp\u003eA CSI Mini Mystery Detective is a single printed page with a crime on it and four lists of clues running down the side. Each clue carries a number, every correct total matches one of them, and that clue is struck out. Sixteen questions later one name, one place, one time and one object are left standing, and those are the answer. The arithmetic is the only way in.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eWhen to Use This Resource\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cp\u003eThese fit the weeks after addition within 20 is secure and a class is meeting two digit columns for the first time. Because nothing carries, students can settle into lining up tens and ones with only one thing to think about, which is exactly what you want before regrouping is taught. Later in the year the same five cases make a solid confidence page for anyone who needs one.\u003c\/p\u003e\n\n\u003cp\u003eUse it for morning work, math centers, early finishers, homework, sub plans and homeschool lessons, with a whole class, a small group or one student.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eGrade Levels\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cp\u003eWritten for 1st grade and 2nd grade. First graders meet these once addition within 20 is secure, and second graders use them as a warm up in the weeks before regrouping starts.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eWhy Teachers Love These Cases\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cul\u003e\n  \u003cli\u003eA wrong answer shows up on its own, because no clue will match it\u003c\/li\u003e\n  \u003cli\u003eNothing to prepare beyond pressing print\u003c\/li\u003e\n  \u003cli\u003eFive cases covers a full week of morning work\u003c\/li\u003e\n  \u003cli\u003eWorks with a whole class, a small group, partners or one student\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eLove this resource?\u003c\/p\u003e\n\n\u003cp\u003eFollow Kiwiland Education to discover more CSI Mini Mystery Detective cases, no-prep math activities, and detective-themed printables for elementary classrooms.\u003c\/p\u003e\n\n\u003cp\u003e\u003ca href=\"https:\/\/www.teacherspayteachers.com\/Sellers-Im-Following\/Add\/Kiwiland\" target=\"_blank\" rel=\"noopener\"\u003eFollow Kiwiland Education on TPT ↗\u003c\/a\u003e\u003c\/p\u003e","brand":"Kiwiland Education","offers":[{"title":"Default Title","offer_id":52012781273458,"sku":"4939074","price":4.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0909\/2848\/0626\/files\/2-digit-addition-without-regrouping-worksheets-1st-2nd-grade-4939074.jpg?v=1792460402"},{"product_id":"missing-numbers-to-120-before-after-mystery-detective-worksheets-grades-1-2-printable-detective-pack","title":"Missing Numbers to 120 (Before \u0026 After) | Mystery Detective Worksheets | Grades 1–2 | Printable Detective Pack","description":"\u003cp\u003eMissing numbers to 120 worksheets for 1st grade and 2nd grade: five monster math cases, Mystery Detective pages of writing the number before and the number after. No prep, print and go, full answer keys: morning work, math centers, early finishers, homework and sub plans. A classmate who is not what they seem, a principal taken over and a monster thief who has emptied the library carry the cases; each right number crosses a suspect off the list, counting past 100 is the only way through, and a first grader will count all morning to catch the CSI Mini Mystery Detective thief.\u003c\/p\u003e\n\n\u003cp\u003eCounting past 100 is where a first grade class stops being able to do it in their heads, and a monster loose in the school is what gets five pages of practice done. A wrong number matches no suspect, so students see the slip themselves, and one case fits a morning work slot. Five math pages from one Mystery Detective download covers the week.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eThe Cases\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003col\u003e\n  \u003cli\u003e\n\u003cstrong\u003eThe Student Monster\u003c\/strong\u003e - one of the class is not what they seem\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eMonster Principal\u003c\/strong\u003e - the principal has been taken over\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eMonster Teacher\u003c\/strong\u003e - and now there is extra homework\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eSchool Imposter Among Us\u003c\/strong\u003e - somebody has infiltrated\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eMonster Thief\u003c\/strong\u003e - all the school books have gone\u003c\/li\u003e\n\u003c\/ol\u003e\n\n\u003cp\u003e\u003cstrong\u003eWhat's Inside\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cul\u003e\n  \u003cli\u003eFive case files on the number before and the number after, to 120\u003c\/li\u003e\n  \u003cli\u003eNumbers run past 100, so the class practices the tricky part\u003c\/li\u003e\n  \u003cli\u003eA suspect list beside the questions, so one answer removes one name\u003c\/li\u003e\n  \u003cli\u003eA red-ink answer key for all five cases\u003c\/li\u003e\n  \u003cli\u003eFive separate monster stories, so no two pages read the same\u003c\/li\u003e\n  \u003cli\u003ePrint and go: no cutting, no laminating, nothing to prepare\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003e\u003cstrong\u003eWhat Is a CSI Mini Mystery Detective?\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cp\u003eA CSI Mini Mystery Detective is one printed page with a crime at the top and a lineup of suspects beside the questions. Every suspect carries a number, the answers on the page produce those numbers, and a match takes that name out. The one nobody matched is the culprit. Nothing is cut, laminated or charged, and counting correctly is the only way through.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eWhen to Use This Resource\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cp\u003eThis belongs in the stretch of first grade where counting to 120 sits in the standards and the class is writing numbers rather than saying them. It is equally useful at the start of second grade as a quick check of what stuck over the summer, and the monster theme makes it an easy pick for October. All the instructions are on the page, so it goes into a sub folder as it is.\u003c\/p\u003e\n\n\u003cp\u003eUse it for morning work, math centers, early finishers, homework, sub plans and homeschool lessons, with a whole class, a small group or one student.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eGrade Levels\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cp\u003eWritten for 1st grade, where counting and writing numbers to 120 sits in the standards. Second graders use it as a start of year check, and kindergarten classes late in the year once they are confident past fifty.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eWhy Teachers Love These Cases\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cul\u003e\n  \u003cli\u003eA miscount matches no suspect, so a child spots it without being told\u003c\/li\u003e\n  \u003cli\u003eNothing to prepare beyond pressing print\u003c\/li\u003e\n  \u003cli\u003eFive short cases covers a week of morning work\u003c\/li\u003e\n  \u003cli\u003eThe monsters carry a class that has gone off number lines\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eLove this resource?\u003c\/p\u003e\n\n\u003cp\u003eFollow Kiwiland Education to discover more CSI Mini Mystery Detective cases, no-prep math activities, and detective-themed printables for elementary classrooms.\u003c\/p\u003e\n\n\u003cp\u003e\u003ca href=\"https:\/\/www.teacherspayteachers.com\/Sellers-Im-Following\/Add\/Kiwiland\" target=\"_blank\" rel=\"noopener\"\u003eFollow Kiwiland Education on TPT ↗\u003c\/a\u003e\u003c\/p\u003e","brand":"Kiwiland Education","offers":[{"title":"Default Title","offer_id":61955606872434,"sku":"8427749","price":4.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0909\/2848\/0626\/files\/missing-numbers-to-120-before-and-after-worksheets-1st-grade-8427749.jpg?v=1792461527"},{"product_id":"10-more-10-less-1-more-1-less-mystery-detective-worksheets-grades-1-2-printable-detective-pack","title":"10 More\/10 Less \u0026 1 More\/1 Less | Mystery Detective Worksheets | Grades 1–2 | Printable Detective Pack","description":"\u003cp\u003e1 more, 1 less, 10 more and 10 less worksheets for 1st grade and 2nd grade, fifteen hundreds chart math pages in the Mystery Detective format. No prep, print and go, with full answer keys, for math centers, morning work, early finishers, homework and sub plans right through the place value unit. Each page is a set of number boxes to complete, single boxes for 1 more and 1 less, then hundreds chart crosses once the two skills mix, with every answer knocking a suspect off the list until a single teacher is left, three levels deep so the whole class works at once, and a wrong square matches no clue, which is how the CSI Mini Mystery Detective pack marks itself as they go.\u003c\/p\u003e\n\n\u003cp\u003eAdding ten is the jump that decides whether a child sees the hundreds chart as a picture or as a list to count along, and working down a column instead of across it is the whole point of the hundreds chart crosses. Cases one to five stay with 1 more and 1 less, six to ten move up and down the column, and eleven to fifteen mix the lot. Three levels, fifteen math pages, one Mystery Detective hunt.\u003c\/p\u003e\n\u003cp\u003eThe first five cases are 1 more and 1 less, the next five are 10 more and 10 less, and the last five mix them. Students fill in missing squares on a piece of the hundreds chart, then cross off the matching clue. A monster has taken over one of the teachers, and the answers show which one.\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eThe Fifteen Cases\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eCases 1 to 5: 1 more and 1 less, moving across the chart\u003c\/li\u003e\n  \u003cli\u003eCases 6 to 10: 10 more and 10 less, moving up and down\u003c\/li\u003e\n  \u003cli\u003eCases 11 to 15: all four mixed together\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhat's Inside\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eFifteen cases in color\u003c\/li\u003e\n  \u003cli\u003eAll fifteen in black and white\u003c\/li\u003e\n  \u003cli\u003eAnswer keys\u003c\/li\u003e\n  \u003cli\u003eFive monster wanted posters\u003c\/li\u003e\n  \u003cli\u003eA display banner\u003c\/li\u003e\n  \u003cli\u003eA teacher instruction page\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhat Is a CSI Mini Mystery Detective?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eIt's a one-page case with a story, number boxes or hundreds chart pieces to fill in, and clue lists with numbers. Students cross off clues that match their answers. One teacher is left at the end.\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhen to Use This Resource\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eUse these once your class can count by tens, and while you're working with the hundreds chart. 2nd graders can use them as a start-of-year review. The three levels make them easy to use with groups at different stages. The wanted posters and banner make a classroom display.\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eGrade Levels\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eWritten for 1st grade and 2nd grade. Kindergarten students can try the 1 more and 1 less level with support.\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhy Teachers Love These Cases\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eThree levels in one pack\u003c\/li\u003e\n  \u003cli\u003eFifteen cases\u003c\/li\u003e\n  \u003cli\u003eWanted posters and a banner\u003c\/li\u003e\n  \u003cli\u003eColor or black and white\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWant more cases like these?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eFollow Kiwiland Education to discover more CSI Mini Mystery Detective cases, no-prep math activities, and detective-themed printables for elementary classrooms.\u003c\/p\u003e\n\u003cp\u003e\u003ca href=\"https:\/\/www.teacherspayteachers.com\/Sellers-Im-Following\/Add\/Kiwiland\" target=\"_blank\" rel=\"noopener\"\u003eFollow Kiwiland Education on TPT ↗\u003c\/a\u003e\u003c\/p\u003e","brand":"Kiwiland Education","offers":[{"title":"Default Title","offer_id":61955626041714,"sku":"7150370","price":4.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0909\/2848\/0626\/files\/1-more-1-less-10-more-10-less-worksheets-1st-2nd-grade-7150370.jpg?v=1792462231"},{"product_id":"easter-adding-subtracting-multiples-of-10-digital-escape-room-math-activity-grades-1-3","title":"Easter Adding \u0026 Subtracting Multiples of 10 Color by Number | Math Activity | Grades 1–3","description":"\u003cp\u003e\u003cstrong\u003eSolve, color, reveal.\u003c\/strong\u003e Students add and subtract multiples of 10, match each answer to the color key, and watch a hidden Easter picture appear square by square. A no-prep, self-checking digital activity that runs in any browser — no apps, no logins, no printing.\u003c\/p\u003e\n\u003ch3\u003eQuick details\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eGrade levels:\u003c\/strong\u003e 1–3\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFormat:\u003c\/strong\u003e Interactive, browser-based color-by-number (digital pixel-art reveal)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eResource type:\u003c\/strong\u003e No-prep, self-checking review activity\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSkill focus:\u003c\/strong\u003e Adding and subtracting multiples of 10\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTech needed:\u003c\/strong\u003e Any device with a web browser\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eHow it works\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eOpen the private link — no app or login required.\u003c\/li\u003e\n\u003cli\u003eSolve each adding or subtracting multiples-of-10 problem.\u003c\/li\u003e\n\u003cli\u003eMatch your answer to the color key and color a piece of the image.\u003c\/li\u003e\n\u003cli\u003eCorrect answers fill the right squares, so the activity checks itself.\u003c\/li\u003e\n\u003cli\u003eComplete the grid to reveal the hidden Easter picture.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eWhat's included\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eAn interactive color-by-number activity hosted on a private site — animated and self-checking.\u003c\/li\u003e\n\u003cli\u003eNo Boom Cards, Google Slides, logins, or subscriptions.\u003c\/li\u003e\n\u003cli\u003eA PDF containing your private access link to share via Google Classroom, email, or any LMS.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eSkills covered\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eAdding and subtracting multiples of 10\u003c\/li\u003e\n\u003cli\u003ePlace value and mental math strategies\u003c\/li\u003e\n\u003cli\u003eCounting forward and backward by tens\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eBest used for\u003c\/h3\u003e\n\u003cp\u003eEaster and spring math centers, tech time, early finishers, sub plans, homeschool, review days, and distance learning.\u003c\/p\u003e","brand":"Kiwiland Education","offers":[{"title":"Default Title","offer_id":61959686259058,"sku":"11240321","price":3.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0909\/2848\/0626\/files\/easter-adding-subtracting-multiples-of-10-digital-escape-room-1.jpg?v=1781993738"},{"product_id":"earth-day-number-after-to-100-color-by-number-math-activity-grades-k-2","title":"Earth Day Number After to 100 Color by Number | Math Activity | Grades K–2","description":"\u003cp\u003eFind the number, color, reveal! In this Earth Day color-by-number, students figure out what comes next, match the missing number to the color key, and fill the grid square by square to uncover a hidden springtime picture — no worksheets, no prep, just a link.\u003c\/p\u003e\n\u003cp\u003eSend the link and let the mystery picture do the motivating. Every square colored correctly brings the Earth Day image into view, and the self-checking design keeps students on track.\u003c\/p\u003e\n\u003ch3\u003eQuick details\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eGrade levels:\u003c\/strong\u003e K–2\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFormat:\u003c\/strong\u003e Interactive, browser-based color-by-number\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eResource type:\u003c\/strong\u003e No-prep, self-checking activity\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSkill focus:\u003c\/strong\u003e Number after \/ missing numbers to 100\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTech needed:\u003c\/strong\u003e Any browser device (Chromebook, laptop, or tablet)\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eThe activity\u003c\/h3\u003e\n\u003cp\u003eA hidden Earth Day picture is waiting under the grid. Students find the number that comes next, match it to the color in the key, and color the squares to reveal the surprise.\u003c\/p\u003e\n\u003ch3\u003eHow it works\u003c\/h3\u003e\n\u003cp\u003eOpen the private link (no app, no login) and start coloring. Find each missing number, choose the color that matches, and watch the grid fill in. Correct answers build the picture while the activity checks itself — finish the grid to reveal the mystery Earth Day image.\u003c\/p\u003e\n\u003ch3\u003eWhat's included\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eAn interactive color-by-number activity on a private site\u003c\/li\u003e\n\u003cli\u003eA mystery Earth Day picture that reveals as students work\u003c\/li\u003e\n\u003cli\u003eNo Boom Cards, Google Slides, logins, or subscriptions\u003c\/li\u003e\n\u003cli\u003eA PDF containing the private access link to share via Google Classroom, email, or any LMS\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eSkills covered\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eIdentifying the number that comes after (1 more)\u003c\/li\u003e\n\u003cli\u003eFilling in missing numbers to 100\u003c\/li\u003e\n\u003cli\u003eCounting sequence and number-order fluency\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eBest used for\u003c\/h3\u003e\n\u003cp\u003eMath centers, tech time, early finishers, sub plans, homeschool, Earth Day and spring activities, review, and distance learning.\u003c\/p\u003e","brand":"Kiwiland Education","offers":[{"title":"Default Title","offer_id":61959757136242,"sku":"11406530","price":3.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0909\/2848\/0626\/files\/earth-day-numbers-to-100-color-by-number-1.jpg?v=1781997907"},{"product_id":"what-comes-next-missing-numbers-digital-escape-room-math-activity-grades-1-2","title":"What Comes Next: Missing Numbers Digital Escape Room | Math Activity | Grades 1–2","description":"\u003cp\u003eLock the lesson and hand over a link. This animated, self-checking digital escape room turns finding the missing number into a fun space mission your young learners will race to finish.\u003c\/p\u003e\u003cp\u003eNo printing, no logins, no prep — just send the private link and let your crew fill in the blanks.\u003c\/p\u003e\u003ch3\u003eQuick details\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eGrade levels:\u003c\/strong\u003e 1–2\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFormat:\u003c\/strong\u003e interactive, browser-based escape room\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eResource type:\u003c\/strong\u003e no-prep digital review game\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSkill focus:\u003c\/strong\u003e identifying what comes next and filling in missing numbers within 100\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTech needed:\u003c\/strong\u003e any device with a web browser\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eThe mission\u003c\/h3\u003e\u003cp\u003eYour crew is locked inside a space station, and each door panel shows a number sequence with a gap. Choose the number that comes next to reveal the code — get it wrong and the door stays sealed.\u003c\/p\u003e\u003ch3\u003eHow the escape room works\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eOpen the private link — no app, no login, no account.\u003c\/li\u003e\n\u003cli\u003eSolve each animated number-sequence challenge.\u003c\/li\u003e\n\u003cli\u003eA correct answer reveals the next code; wrong answers won't unlock the door.\u003c\/li\u003e\n\u003cli\u003eCrack the final code to complete the mission and escape.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eWhat's included\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eAn interactive escape room hosted on a private site (animated, with randomized answers for replayability).\u003c\/li\u003e\n\u003cli\u003eNo Boom Cards, Google Slides, logins, or subscriptions required.\u003c\/li\u003e\n\u003cli\u003eA PDF containing the private access link to share via Google Classroom, email, or any LMS.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eSkills covered\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eIdentifying what comes next in a sequence\u003c\/li\u003e\n\u003cli\u003eFilling in missing numbers within 100\u003c\/li\u003e\n\u003cli\u003eCounting forward by ones\u003c\/li\u003e\n\u003cli\u003eRecognizing number patterns\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eBest used for\u003c\/h3\u003e\u003cp\u003eMath centers, tech time, early finishers, sub plans, homeschool, review, and distance learning.\u003c\/p\u003e","brand":"Kiwiland Education","offers":[{"title":"Default Title","offer_id":61961746612594,"sku":"11474065","price":3.5,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0909\/2848\/0626\/files\/what-comes-next-missing-numbers-digital-escape-room-1.jpg?v=1782086448"},{"product_id":"number-order-to-100-digital-escape-room-math-activity-grades-1-2","title":"Number Order to 100 Digital Escape Room | Math Activity | Grades 1–2","description":"\u003cp\u003eLock the lesson and hand over a link. This animated, self-checking digital escape room turns ordering numbers to 100 into a fun spy training mission your young learners will race to finish.\u003c\/p\u003e\u003cp\u003eNo printing, no logins, no prep — just send the private link and let your recruits put the numbers in order.\u003c\/p\u003e\u003ch3\u003eQuick details\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eGrade levels:\u003c\/strong\u003e 1–2\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFormat:\u003c\/strong\u003e interactive, browser-based escape room\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eResource type:\u003c\/strong\u003e no-prep digital review game\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSkill focus:\u003c\/strong\u003e ordering numbers to 100 from least to greatest\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTech needed:\u003c\/strong\u003e any device with a web browser\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eThe mission\u003c\/h3\u003e\u003cp\u003eYour young agents are in training, and each locked door shows a set of numbers out of order. Put them least to greatest to reveal the code — a wrong order keeps the door shut.\u003c\/p\u003e\u003ch3\u003eHow the escape room works\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eOpen the private link — no app, no login, no account.\u003c\/li\u003e\n\u003cli\u003eSolve each animated ordering challenge.\u003c\/li\u003e\n\u003cli\u003eA correct answer reveals the next code; wrong answers won't unlock the door.\u003c\/li\u003e\n\u003cli\u003eCrack the final code to complete the mission and escape.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eWhat's included\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eAn interactive escape room hosted on a private site (animated, with randomized answers for replayability).\u003c\/li\u003e\n\u003cli\u003eNo Boom Cards, Google Slides, logins, or subscriptions required.\u003c\/li\u003e\n\u003cli\u003eA PDF containing the private access link to share via Google Classroom, email, or any LMS.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eSkills covered\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eOrdering numbers to 100 least to greatest\u003c\/li\u003e\n\u003cli\u003eComparing two-digit numbers\u003c\/li\u003e\n\u003cli\u003ePlace-value understanding of tens and ones\u003c\/li\u003e\n\u003cli\u003eBuilding number sense\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eBest used for\u003c\/h3\u003e\u003cp\u003eMath centers, tech time, early finishers, sub plans, homeschool, review, and distance learning.\u003c\/p\u003e","brand":"Kiwiland Education","offers":[{"title":"Default Title","offer_id":61961746710898,"sku":"12191604","price":3.5,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0909\/2848\/0626\/files\/number-order-to-100-digital-escape-room-1.jpg?v=1782086848"},{"product_id":"missing-numbers-to-120-back-to-school-mystery-detective-grades-1-2-detective-mystery","title":"Missing Numbers to 120 | Back to School Mystery | Grades 1–2 | Detective Mystery","description":"\u003cp\u003eMissing numbers to 120 worksheets for 1st grade: three CSI Mini Mystery Detective math cases where students write the number before and after, then cross a suspect off the lineup until the culprit is left. One case runs to 100 and two to 120, so counting practice is built in from the first week back, and every answer matches one suspect only. Back to school math activities for August and September, then morning work, math centers, early finishers and sub plans whenever number order slips.\u003c\/p\u003e\n\n\u003cp\u003eThe first week of first grade is for finding out who can count past a ten without the chart on the wall, and this does it without anything that looks like a test. Students fill the gaps, match the numbers to a suspect and cross the name off, so they keep going for the culprit. Three CSI Mini Mystery Detective math cases, three mornings, answer keys included.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eThe Cases\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003col\u003e\n  \u003cli\u003e\n\u003cstrong\u003eThe Teachers Lunchbox\u003c\/strong\u003e - gone, and nobody saw a thing\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eThe Missing Teacher\u003c\/strong\u003e - a teacher has disappeared\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eThe Missing Art Supplies\u003c\/strong\u003e - the art cupboard is emptied\u003c\/li\u003e\n\u003c\/ol\u003e\n\n\u003cp\u003e\u003cstrong\u003eWhat's Inside\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cul\u003e\n  \u003cli\u003eThree case files, each with a crime sheet and its own lineup of suspects\u003c\/li\u003e\n  \u003cli\u003eMissing numbers before and after, to 100 on one case and to 120 on the others\u003c\/li\u003e\n  \u003cli\u003eNumber sequences printed with gaps for students to fill in\u003c\/li\u003e\n  \u003cli\u003eEach answer matches one suspect and no other, so the page checks itself\u003c\/li\u003e\n  \u003cli\u003eA full answer key for every case\u003c\/li\u003e\n  \u003cli\u003ePrint and go: no cutting, no laminating, nothing to prepare\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003e\u003cstrong\u003eWhat Is a CSI Mini Mystery Detective?\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cp\u003eA CSI Mini Mystery Detective hands your class a crime and a lineup and asks them to solve it with math. Work the crime sheet, match each answer to the suspect carrying that number, cross the name off, and keep going until one suspect has not been ruled out. Because the elimination only works when the numbers are right, these detective activities make students check themselves in a way math worksheets rarely do. One case takes about a class period, with nothing to prepare.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eWhen to Use This Resource\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cp\u003eAugust and September is where this belongs, in the first weeks back when the counting sequence has gone soft over the summer and you need to see who has kept it. The set tells you that quickly, because a student who cannot go past 109 will cross off the wrong suspect and know it straight away. It is a check on the skill that does not feel like a test to the child sitting it.\u003c\/p\u003e\n\n\u003cp\u003eUse it for test prep, homework, math centers, morning work, early finishers, sub plans and homeschool lessons, with a whole class, a small group or one student alone.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eGrade Levels\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cp\u003eWritten for 1st grade, where counting to 120 sits in the standards, and used with 2nd graders as a start of year check. Kindergarten classes take the case that stops at 100 once they are confident past fifty.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eWhy Teachers Love These Cases\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cul\u003e\n  \u003cli\u003eShows you fast which students lose the sequence at the tens\u003c\/li\u003e\n  \u003cli\u003eStudents find their own mistakes as the suspects come off\u003c\/li\u003e\n  \u003cli\u003eNo prep in the busiest weeks of the year\u003c\/li\u003e\n  \u003cli\u003eWorks with a whole class, a small group, partners, or one student alone\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eLove this resource?\u003c\/p\u003e\n\n\u003cp\u003eFollow Kiwiland Education to discover more CSI Mini Mystery Detective cases, no-prep math activities, and detective-themed printables for elementary classrooms.\u003c\/p\u003e\n\n\u003cp\u003e\u003ca href=\"https:\/\/www.teacherspayteachers.com\/Sellers-Im-Following\/Add\/Kiwiland\" target=\"_blank\" rel=\"noopener\"\u003eFollow Kiwiland Education on TPT ↗\u003c\/a\u003e\u003c\/p\u003e","brand":"Kiwiland Education","offers":[{"title":"Default Title","offer_id":62005465055602,"sku":"10067300","price":4.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0909\/2848\/0626\/files\/missing-numbers-to-120-before-and-after-worksheets-10067300.jpg?v=1792461527"},{"product_id":"100th-day-of-school-missing-numbers-to-100-mystery-detective-activity","title":"100th Day of School Missing Numbers to 100 Mystery Detective Activity","description":"\u003cp\u003e100th day of school math worksheets for 1st grade and 2nd grade: five cases of missing numbers to 100, where the number before and the number after is what crosses a place or a number off the clue list. The 100 day treats have gone, a hundred stickers are nowhere in sight and a hundred gremlins are loose in the school, so counting to 100 is the only way through, and a wrong number matches no clue. Print and go with full answer keys: no prep CSI Mini Mystery Detective math cases for morning work, math centers, early finishers, homework and sub plans.\u003c\/p\u003e\n\n\u003cp\u003eThe 100th day of school lands in late January in most rooms, and it needs something the class will sit down and do between the crown-making and the counting collections. A six year old will write the number before and after all morning to find out where the chocolates went, and one case fits a morning work slot. Five math cases in one Mystery Detective download covers the week around it.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eThe Cases\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003col\u003e\n  \u003cli\u003e\n\u003cstrong\u003eMissing Chocolates\u003c\/strong\u003e - the 100 day treats have gone\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eMissing Number to 100\u003c\/strong\u003e - one number is off the chart\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eMissing Stickers\u003c\/strong\u003e - a hundred stickers, none in sight\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003e100 Hidden Gremlins\u003c\/strong\u003e - gremlins loose in the school\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003ePrincipals Birthday\u003c\/strong\u003e - nobody knows their age\u003c\/li\u003e\n\u003c\/ol\u003e\n\n\u003cp\u003e\u003cstrong\u003eWhat's Inside\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cul\u003e\n  \u003cli\u003eFive case files on the number before and the number after to 100\u003c\/li\u003e\n  \u003cli\u003eTwelve questions a page: three cases on the number after, two on the number before\u003c\/li\u003e\n  \u003cli\u003eOne case works in number words, so reading numbers gets practiced as well\u003c\/li\u003e\n  \u003cli\u003eA dozen clues down the side, crossed off one answer at a time\u003c\/li\u003e\n  \u003cli\u003eA red-ink answer key for all five cases, and a certificate page for a closed case\u003c\/li\u003e\n  \u003cli\u003ePrint and go: no cutting, no laminating, nothing to prepare\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003e\u003cstrong\u003eWhat Is a CSI Mini Mystery Detective?\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cp\u003eA CSI Mini Mystery Detective is one printed page with a crime at the top and a list of clues beside the questions. Each clue carries a number, the answers on the page produce those numbers, and a match strikes that clue out. The one clue nobody matched is the solution. Nothing is cut, laminated or charged, and counting correctly is the only way through.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eWhen to Use This Resource\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cp\u003eThe obvious week is the 100th day itself, in late January or early February, and the days either side when the room is full of hundred-themed everything. It works as ordinary number sense practice at any point, because the child is counting on and counting back inside a hundred. All the instructions are on the page, so it goes into a sub folder as it is.\u003c\/p\u003e\n\n\u003cp\u003eUse it for morning work, math centers, early finishers, homework, sub plans and homeschool lessons, with a whole class, a small group or one student.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eGrade Levels\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cp\u003eWritten for 1st grade, where writing numbers to 100 sits in the standards. Second graders use it as a start of year check, and kindergarten classes late in the year once they are confident past fifty.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eWhy Teachers Love These Cases\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cul\u003e\n  \u003cli\u003eA miscount matches no clue, so a child spots it without being told\u003c\/li\u003e\n  \u003cli\u003eNothing to prepare on a day that is already busy\u003c\/li\u003e\n  \u003cli\u003eFive short cases covers the hundredth-day week\u003c\/li\u003e\n  \u003cli\u003eWorks with a whole class, a small group, partners or one student\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eLove this resource?\u003c\/p\u003e\n\n\u003cp\u003eFollow Kiwiland Education to discover more CSI Mini Mystery Detective cases, no-prep math activities, and detective-themed printables for elementary classrooms.\u003c\/p\u003e\n\n\u003cp\u003e\u003ca href=\"https:\/\/www.teacherspayteachers.com\/Sellers-Im-Following\/Add\/Kiwiland\" target=\"_blank\" rel=\"noopener\"\u003eFollow Kiwiland Education on TPT ↗\u003c\/a\u003e\u003c\/p\u003e","brand":"Kiwiland Education","offers":[{"title":"Default Title","offer_id":62008160813426,"sku":"8936430","price":4.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0909\/2848\/0626\/files\/100th-day-of-school-numbers-before-and-after-to-100-worksheets-8936430.jpg?v=1792460272"},{"product_id":"100s-chart-missing-numbers-within-100-monster-mystery-detective-activity","title":"100s Chart Missing Numbers Within 100 Monster Mystery Detective Activity","description":"\u003cp\u003eMissing numbers to 100 worksheets for 1st grade and 2nd grade, hundreds chart practice built as five monster Mystery Detective math cases, the number before and the number after on every page. Print and go with full answer keys as back to school math activities for August and September, then no prep morning work, math centers, early finishers, homework and sub plans whenever number order slips. Monsters are loose in the school, each number a student writes crosses a suspect off the lineup, and a wrong number matches nobody, so this CSI Mini Mystery Detective set is counting to 100 the way it is tested and marks itself.\u003c\/p\u003e\n\n\u003cp\u003eThe first month of first grade is for finding out who can count past a ten without the chart on the wall, and five monster CSI Mini Mystery Detective math cases do it without anything that looks like a test. A six year old fills the gaps to catch the monster, the lineup tells them when a number is wrong, and one case fits a morning work slot.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eThe Cases\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003col\u003e\n  \u003cli\u003e\n\u003cstrong\u003eThe Student Monster\u003c\/strong\u003e - something is loose in the school\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eMonster Principal\u003c\/strong\u003e - the principal is not himself today\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eMonster Teacher\u003c\/strong\u003e - extra schoolwork for everybody\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eSchool Imposter Among Us\u003c\/strong\u003e - something got inside the school\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eMonster Thief\u003c\/strong\u003e - every school book has gone\u003c\/li\u003e\n\u003c\/ol\u003e\n\n\u003cp\u003e\u003cstrong\u003eWhat's Inside\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cul\u003e\n  \u003cli\u003eFive case files, each with a crime sheet and its own lineup of suspects\u003c\/li\u003e\n  \u003cli\u003eMissing numbers to 100, and the numbers that come before and after\u003c\/li\u003e\n  \u003cli\u003eSequences printed with gaps, the way they appear on a hundreds chart\u003c\/li\u003e\n  \u003cli\u003eEach answer matches one suspect and no other, so the page checks itself\u003c\/li\u003e\n  \u003cli\u003eA full answer key for every case\u003c\/li\u003e\n  \u003cli\u003ePrint and go: no cutting, no laminating, nothing to prepare\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003e\u003cstrong\u003eWhat Is a CSI Mini Mystery Detective?\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cp\u003eA CSI Mini Mystery Detective is one printed page carrying one crime and one lineup of suspects. Each suspect has a number, the crime sheet produces those numbers, and a correct answer takes that suspect out until a single name is left. Nothing is laminated, charged or bought, so the math does the whole job, and that is the difference between these detective activities and a page of math worksheets. A case runs about a class period.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eWhen to Use This Resource\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cp\u003eUse these while the hundreds chart is still on the wall and you want to know who can work without it. They show you quickly which children lose the sequence when they cross a ten, which is the bit that matters for everything that comes after. The monsters do the work of holding attention, and a wrong number crosses off the wrong suspect so the child spots it themselves.\u003c\/p\u003e\n\n\u003cp\u003eTeachers use it for test prep, homework, math centers, morning work, early finishers, sub plans and homeschool lessons, with a class, a small group or one child alone.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eGrade Levels\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cp\u003eWritten for 1st grade, where counting and writing numbers to 100 sits in the standards, and used with 2nd graders as a start of year check. Kindergarten classes take it late in the year once they are confident past fifty.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eWhy Teachers Love These Cases\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cul\u003e\n  \u003cli\u003eShows you who is counting past a ten and who is guessing\u003c\/li\u003e\n  \u003cli\u003eStudents correct themselves as the wrong monster comes off the lineup\u003c\/li\u003e\n  \u003cli\u003eNo prep, and the answer keys make grading quick\u003c\/li\u003e\n  \u003cli\u003eWorks with a whole class, a small group, partners, or one student alone\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eLove this resource?\u003c\/p\u003e\n\n\u003cp\u003eFollow Kiwiland Education to discover more CSI Mini Mystery Detective cases, no-prep math activities, and detective-themed printables for elementary classrooms.\u003c\/p\u003e\n\n\u003cp\u003e\u003ca href=\"https:\/\/www.teacherspayteachers.com\/Sellers-Im-Following\/Add\/Kiwiland\" target=\"_blank\" rel=\"noopener\"\u003eFollow Kiwiland Education on TPT ↗\u003c\/a\u003e\u003c\/p\u003e","brand":"Kiwiland Education","offers":[{"title":"Default Title","offer_id":62008162615666,"sku":"8408438","price":4.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0909\/2848\/0626\/files\/100s-chart-missing-numbers-worksheets-1st-grade-8408438.jpg?v=1792460271"},{"product_id":"back-to-school-addition-word-problems-within-100-math-detective-mystery","title":"Back to School Addition Word Problems Within 100 Math Detective Mystery","description":"\u003cp\u003eAddition word problems within 100 worksheets for 2nd grade and 3rd grade, three back to school CSI Mini Mystery Detective math cases set in the classroom. Every one step word problem is written in short plain sentences, so the reading stays out of the way of the math, and each answer crosses a suspect off the lineup until one name is left. No prep math activities for August and September, then math centers, small groups, early finishers, homework and sub plans, with full answer keys.\u003c\/p\u003e\n\n\u003cp\u003eWord problems are the part of the week most second graders put off, and a CSI Mini Mystery Detective math case with a suspect at the end is the reason they read to the last line. Because the answer has to match a name, students check their own adding before they cross anyone off, and the class works through a page without you reading every question aloud.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eThe Cases\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003col\u003e\n  \u003cli\u003e\n\u003cstrong\u003eThe Teachers Lunchbox\u003c\/strong\u003e - gone, and nobody saw a thing\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eThe Missing Teacher\u003c\/strong\u003e - a teacher has disappeared\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eThe Missing Art Supplies\u003c\/strong\u003e - the art cupboard is emptied\u003c\/li\u003e\n\u003c\/ol\u003e\n\n\u003cp\u003e\u003cstrong\u003eWhat's Inside\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cul\u003e\n  \u003cli\u003eThree case files, each with a crime sheet of word problems and its own lineup of suspects\u003c\/li\u003e\n  \u003cli\u003eOne step addition word problems within 100\u003c\/li\u003e\n  \u003cli\u003eShort, plain sentences, so the reading does not get in the way of the math\u003c\/li\u003e\n  \u003cli\u003eEach answer matches one suspect and no other, so the page checks itself\u003c\/li\u003e\n  \u003cli\u003eA full answer key for every case\u003c\/li\u003e\n  \u003cli\u003ePrint and go: no cutting, no laminating, nothing to prepare\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003e\u003cstrong\u003eWhat Is a CSI Mini Mystery Detective?\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cp\u003eA CSI Mini Mystery Detective is one page, one crime and one class period. Students read the brief, work the questions, and match each answer to a suspect in the lineup, striking names off until the last one is the culprit. Nothing is assembled and nothing is bought, so the math carries the whole thing, which is what makes these detective activities different from a set of math worksheets. It works as a lesson, a math center, or a page left for a substitute.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eWhen to Use This Resource\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cp\u003eWord problems are the part of the year students dig their heels in over, and this is the set that gets them past the first sentence. Use it when you start one step problems, then again before testing, when the class can add perfectly well but stops reading the moment a question has words in it. Every problem points at a suspect, so there is a reason to finish the sentence.\u003c\/p\u003e\n\n\u003cp\u003eIt works for test prep, homework, math centers, morning work, early finishers, sub plans and homeschool lessons, with a whole class, a small group or one student alone.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eGrade Levels\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cp\u003eWritten for 2nd grade, where one step addition word problems within 100 sit in the standards, and used with 3rd graders as a start of year warm up. First graders take it late in the year with the teacher reading the briefs aloud.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eWhy Teachers Love These Cases\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cul\u003e\n  \u003cli\u003ePlain wording, so a slow reader is not stopped before the math starts\u003c\/li\u003e\n  \u003cli\u003eStudents check themselves as the wrong suspect comes off the lineup\u003c\/li\u003e\n  \u003cli\u003eNo prep, and the answer keys make grading quick\u003c\/li\u003e\n  \u003cli\u003eWorks with a whole class, a small group, partners, or one student alone\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eLove this resource?\u003c\/p\u003e\n\n\u003cp\u003eFollow Kiwiland Education to discover more CSI Mini Mystery Detective cases, no-prep math activities, and detective-themed printables for elementary classrooms.\u003c\/p\u003e\n\n\u003cp\u003e\u003ca href=\"https:\/\/www.teacherspayteachers.com\/Sellers-Im-Following\/Add\/Kiwiland\" target=\"_blank\" rel=\"noopener\"\u003eFollow Kiwiland Education on TPT ↗\u003c\/a\u003e\u003c\/p\u003e","brand":"Kiwiland Education","offers":[{"title":"Default Title","offer_id":62014832968050,"sku":"10017338","price":4.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0909\/2848\/0626\/files\/one-step-addition-word-problems-within-100-worksheets-10017338.jpg?v=1792461264"},{"product_id":"addition-subtraction-word-problems-within-100-mystery-detective-worksheets-grades-1-3","title":"Addition \u0026 Subtraction Word Problems Within 100 | Mystery Detective Worksheets | Grades 1–3","description":"\u003cp\u003eAddition and subtraction word problems, two-digit story problem worksheets, and add and subtract within 100 practice for 1st grade, 2nd grade, and 3rd grade are all included in this school-themed Mini Mystery Detective pack of math worksheets. Students solve one-step word problems to crack five detective cases, matching every answer to a suspect and crossing that suspect off until only the villain is left standing. Completely no prep - just print and go.\u003c\/p\u003e\n\n\u003cp\u003eUse it as a two-digit addition and subtraction review, a regrouping and borrowing practice set, a no-prep math sub plan, a spiral review before a unit test, a homework packet, or a station in your math centers. The problems cover adding to, taking from, putting together, taking apart and comparing, so students have to work out which operation the story is really asking for instead of repeating the same move all the way down the page.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eWhat's Inside\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cul\u003e\n  \u003cli\u003eSolving one-step addition word problems within 100 - joining situations (the shelf held 43 crayons and the teacher added 18 more) and putting-together situations (55 big canvases and 11 small canvases)\u003c\/li\u003e\n  \u003cli\u003eSolving one-step subtraction word problems within 100 - taking-away situations (73 sheets of paper and Room 2 used 38) and comparing situations (86 pencils and 40 pens, how many fewer pens)\u003c\/li\u003e\n  \u003cli\u003eWorking out which operation a story calls for when no key word gives it away, which is exactly where comparing problems catch students out\u003c\/li\u003e\n  \u003cli\u003eAdding and subtracting two-digit numbers with and without regrouping and borrowing\u003c\/li\u003e\n  \u003cli\u003eReading a word problem carefully and pulling the two numbers that matter out of it\u003c\/li\u003e\n  \u003cli\u003eChecking their own work - a wrong answer leaves two suspects standing, so students know to go back and find it themselves\u003c\/li\u003e\n  \u003cli\u003eEvery page provided ready to print with no preparation\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eFive school mysteries to solve: the paint pot puzzle, the empty seed tray, the silent stage, the late school bus and the playground prank. Answer keys included for every case.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eWhat is a Mini Mystery Detective?\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cp\u003eA no-prep detective activity where students solve math problems to cross off suspects and unmask the culprit. Every suspect wears an ID badge, and each correct answer matches one of them - so solving the page eliminates them one at a time until a single suspect is left. Skill practice plus critical thinking in one engaging, self-checking worksheet set.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eWhen to Use This Resource\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cul\u003e\n  \u003cli\u003eMath centers and rotations\u003c\/li\u003e\n  \u003cli\u003eMorning work and warm-ups\u003c\/li\u003e\n  \u003cli\u003eEarly finishers\u003c\/li\u003e\n  \u003cli\u003eSub days and emergency plans\u003c\/li\u003e\n  \u003cli\u003eHomework\u003c\/li\u003e\n  \u003cli\u003eSpiral review and test prep\u003c\/li\u003e\n  \u003cli\u003eSmall-group intervention\u003c\/li\u003e\n  \u003cli\u003eWhole-class problem solving\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003e\u003cstrong\u003eGrade Levels\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cp\u003eDesigned for 2nd graders. Also beneficial for struggling 3rd graders who need extra practice with word problems and advanced 1st graders ready for a challenge.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eWhy Teachers Love Mystery Detectives\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cul\u003e\n  \u003cli\u003eZero prep - just print and hand it out\u003c\/li\u003e\n  \u003cli\u003eSelf-checking, so students spot their own mistakes instead of waiting to be marked\u003c\/li\u003e\n  \u003cli\u003eThe detective hook keeps the whole class on task, including the students who usually stall on word problems\u003c\/li\u003e\n  \u003cli\u003eReal skill practice, not busy work - every case is a full page of problem solving\u003c\/li\u003e\n  \u003cli\u003eAll four addition and subtraction situation types on every page, so no student can coast on one strategy\u003c\/li\u003e\n  \u003cli\u003eAnswer keys make marking quick\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003e\u003cstrong\u003eLove this resource?\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cp\u003eFollow Kiwiland Education to discover more Mystery Detectives, word problem worksheets, and detective-themed stories for elementary classrooms.\u003c\/p\u003e","brand":"Kiwiland Education","offers":[{"title":"Default Title","offer_id":62170498859378,"sku":"17212683","price":4.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0909\/2848\/0626\/files\/addition-and-subtraction-word-problems-2nd-grade-mystery-detective-worksheets-17212683.jpg?v=1792461264"},{"product_id":"1-more-1-less-10-more-10-less-mystery-detective-worksheets-grades-1-2-back-to-school","title":"1 More 1 Less 10 More 10 Less | Mystery Detective Worksheets | Grades 1–2 | Back to School","description":"\u003cp\u003e1 more 1 less and 10 more 10 less activities, place value worksheets, and mental math practice for 1st grade and 2nd grade are all included in this Mini Mystery Detective pack with a school theme. There are fifteen detective cases. Use them for math centers, morning work, early finishers or homework. It's no prep, with an answer key for every case.\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhat's Inside\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cul\u003e\n  \u003cli\u003eFinding 1 more and 1 less than a two-digit number: 45 and 46, 76 and 77, 98 and 99\u003c\/li\u003e\n  \u003cli\u003eFinding 10 more and 10 less than a two-digit number: 23 and 33, 62 and 72, 89 and 99\u003c\/li\u003e\n  \u003cli\u003eMixed practice on one page - 1 more, 1 less, 10 more and 10 less around the same number at once\u003c\/li\u003e\n  \u003cli\u003eReading and completing a number chart to build mental math fluency without counting on\u003c\/li\u003e\n  \u003cli\u003eUsing answers to eliminate suspects, which makes every page self-checking\u003c\/li\u003e\n  \u003cli\u003eFull answer keys for every case\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eFifteen school mysteries to crack: the missing class pet, the stolen markers, the silent lunch bell, the vanished trophy, the empty book bin, the lost-and-found box, the cookie caper, the deflated ball, the muddy footprints, the missing fire key, the swapped name tags, the missing microphone, the stolen poster, the locked closet, and the missing album.\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhat is a Mini Mystery Detective?\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cp\u003eA no-prep detective activity where students solve math problems to cross off suspects and unmask the culprit. Every answer matches one suspect's number. Correct answers eliminate them one by one until a single suspect is left.\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhen to Use This Resource\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cul\u003e\n  \u003cli\u003eWarm-ups\u003c\/li\u003e\n  \u003cli\u003eSub days\u003c\/li\u003e\n  \u003cli\u003eSmall-group intervention\u003c\/li\u003e\n  \u003cli\u003eSpiral review and test prep\u003c\/li\u003e\n  \u003cli\u003eWhole-class place value practice\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eGrade Levels\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cp\u003eDesigned for 1st and 2nd graders. It also gives 3rd graders more place value practice, and works for advanced kindergarteners.\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhy Teachers Love Mystery Detectives\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cul\u003e\n  \u003cli\u003eNothing to prepare\u003c\/li\u003e\n  \u003cli\u003eSelf-checking\u003c\/li\u003e\n  \u003cli\u003eMysteries set around a school\u003c\/li\u003e\n  \u003cli\u003eMental math practice with some logical thinking\u003c\/li\u003e\n  \u003cli\u003eFifteen separate one-page cases\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWant more cases like these?\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cp\u003eFollow Kiwiland Education to discover more Mystery Detectives, place value activities, and detective-themed stories for elementary classrooms.\u003c\/p\u003e\n\u003cp\u003e\u003ca href=\"https:\/\/www.teacherspayteachers.com\/Sellers-Im-Following\/Add\/Kiwiland\" target=\"_blank\" rel=\"noopener\"\u003eFollow Kiwiland Education on TPT ↗\u003c\/a\u003e\u003c\/p\u003e","brand":"Kiwiland Education","offers":[{"title":"Default Title","offer_id":62170873430386,"sku":"17191551","price":4.5,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0909\/2848\/0626\/files\/1-more-1-less-10-more-10-less-mystery-detective-worksheets-grades-1-2-17191551.jpg?v=1792462230"},{"product_id":"10-more-10-less-1-more-1-less-mystery-detective","title":"10 More 10 Less, 1 More 1 Less | Mystery Detective | Grades 1–3 | Back to School","description":"\u003cp\u003eThree CSI Mini Mystery Detective math case files for 1st grade and 2nd grade, on 10 more 10 less and 1 more 1 less. Students work the number sense problems on each crime sheet, then use the answers to cross a suspect off the lineup until one name is left, which turns number relationships into math worksheets and math activities your class will finish. Back to school math for August and September, with a school theme running through all three cases, then math centers, early finishers, homework, morning work, sub plans and test prep for the rest of the year. Print and go CSI math, with full answer keys and detective activities your class can run on their own.\u003c\/p\u003e\n\n\u003cp\u003e\u003c!--LEAD--\u003eFirst graders will work through ten more and ten less all morning when there is someone to catch at the end of it. Each answer your class works out takes a suspect off the lineup, so a six year old keeps going because they want to know who did it. Short pages, so one case fits a morning work slot, and the answer keys are behind every one.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eThe Cases\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003col\u003e\n  \u003cli\u003e\n\u003cstrong\u003eThe Half-Eaten Apple\u003c\/strong\u003e - half the teacher's apple is gone\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eThe Missing Principal\u003c\/strong\u003e - the principal is nowhere to be found\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eThe School Supplies\u003c\/strong\u003e - the whole classroom stash is gone\u003c\/li\u003e\n\u003c\/ol\u003e\n\n\n\n\n\n\u003cp\u003e\u003cstrong\u003eWhat's Inside\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cul\u003e\n  \u003cli\u003eThree case files, each with a crime sheet and its own lineup of suspects\u003c\/li\u003e\n  \u003cli\u003e1 more, 1 less, 10 more and 10 less on every page\u003c\/li\u003e\n  \u003cli\u003eNumbers stay inside 120, so the counting is the work and not the reading\u003c\/li\u003e\n  \u003cli\u003eEach answer matches one suspect and no other, so the page checks itself\u003c\/li\u003e\n  \u003cli\u003eA full answer key for every case\u003c\/li\u003e\n  \u003cli\u003ePrint and go: no cutting, no laminating, nothing to prepare\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\n\n\n\n\u003cp\u003e\u003cstrong\u003eWhat Is a CSI Mini Mystery Detective?\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cp\u003eA CSI Mini Mystery Detective is one printed page holding one crime. The suspects stand in a lineup with a number each, the questions on the crime sheet produce those numbers, and a correct answer knocks a suspect out until the last one left is the culprit. Nothing is cut out or laminated, so what does the work is the arithmetic itself, and that is the difference between these detective activities and a page of math worksheets. One case runs for a class period.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eWhen to Use This Resource\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cp\u003eSlot this into the number sense unit, right after your class has met adding and taking ten on a hundred chart and needs to do it without one. It is also the page to hand out later in the year when the skill has quietly gone, which with 10 more and 10 less it always does. Because a wrong answer strikes off the wrong suspect, young students notice the mistake themselves.\u003c\/p\u003e\n\n\u003cp\u003eTeachers use it for test prep, homework, math centers, morning work, early finishers, sub plans and homeschool lessons, with a whole class, a small group or one child alone.\u003c\/p\u003e\n\n\n\n\n\n\u003cp\u003e\u003cstrong\u003eGrade Levels\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cp\u003eWritten for 1st grade and 2nd grade, where 1 more, 1 less, 10 more and 10 less sit in the standards. Kindergarten classes take the 1 more and 1 less case at the end of the year, and third graders use the set as a fast warm up before 100 more and 100 less.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eWhy Teachers Love These Cases\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cul\u003e\n  \u003cli\u003eSmall numbers and short pages, which suits a first grade attention span\u003c\/li\u003e\n  \u003cli\u003eStudents see their own mistakes as the wrong suspect comes off the lineup\u003c\/li\u003e\n  \u003cli\u003eNo prep, and the answer keys make grading quick\u003c\/li\u003e\n  \u003cli\u003eWorks with a whole class, a small group, partners, or one student alone\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\n\n\n\n\u003cp\u003eLove this resource?\u003c\/p\u003e\n\n\u003cp\u003eFollow Kiwiland Education to discover more CSI Mini Mystery Detective cases, no-prep math activities, and detective-themed printables for elementary classrooms.\u003c\/p\u003e\n\n\u003cp\u003e\u003ca href=\"https:\/\/www.teacherspayteachers.com\/Sellers-Im-Following\/Add\/Kiwiland\"\u003ehttps:\/\/www.teacherspayteachers.com\/Sellers-Im-Following\/Add\/Kiwiland\u003c\/a\u003e\u003c\/p\u003e","brand":"Kiwiland Education","offers":[{"title":"Default Title","offer_id":62593068958066,"sku":"10082851","price":4.0,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0909\/2848\/0626\/files\/10-more-10-less-1-more-1-less-worksheets-grade-1-2.jpg?v=1792612221"}],"url":"https:\/\/kiwilandeducation.com\/collections\/math-1-nbt.oembed","provider":"Kiwiland Education","version":"1.0","type":"link"}