{"title":"Grade 2 Math: Operations \u0026 Algebraic Thinking","description":"\u003cp\u003e2nd grade math worksheets and activities for operations \u0026amp; algebraic thinking (Common Core 2.OA): printable mystery worksheets, CSI cases and digital escape rooms.\u003c\/p\u003e","products":[{"product_id":"early-multiplication-arrays-mystery-detective-worksheets-grades-k-4-monster-theme","title":"Early Multiplication Arrays | Mystery Detective Worksheets | Grades K–4 | Monster Theme","description":"\u003cp\u003eEarly multiplication arrays worksheets for 1st grade and 2nd grade, ten beginner math pages with a Mystery Detective twist, equal groups and small arrays a first grader can count. No prep, print and go, full answer keys, for math centers, morning work, early finishers, homework and sub plans as soon as skip counting starts. Students count the rows and columns, write the multiplication, and every correct answer takes a suspect off the board until the teacher who turned into a monster stands alone, five cases asking for the product and five for the factors, so one CSI Mini Mystery Detective download covers the first two weeks of arrays with the checking built into the page.\u003c\/p\u003e\n\n\u003cp\u003eThis is the step where counting in twos and fives turns into something a child can write down, and reading an array as three rows of four rather than twelve dots needs more repeats than any single worksheet allows. Ten cases spread it across two weeks, and a class asks for the next one. Small arrays, one Mystery Detective hunt, math that marks itself.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eThe Ten Cases\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cul\u003e\n  \u003cli\u003eCases one to five - read the array, write the product\u003c\/li\u003e\n  \u003cli\u003eCases six to ten - read the same kind of array, write the factors\u003c\/li\u003e\n  \u003cli\u003eTwelve arrays on every case, each answer knocking out a clue\u003c\/li\u003e\n  \u003cli\u003eSmall arrays throughout, the sizes a first grade class can count\u003c\/li\u003e\n  \u003cli\u003eOne running story - a teacher in the school has turned into a monster\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003e\u003cstrong\u003eWhat's Inside\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cul\u003e\n  \u003cli\u003eTen case files in full color\u003c\/li\u003e\n  \u003cli\u003eThe same ten cases again in black and white for cheap printing\u003c\/li\u003e\n  \u003cli\u003eAnswer keys for every case\u003c\/li\u003e\n  \u003cli\u003eA wanted poster and banner deck for the classroom wall\u003c\/li\u003e\n  \u003cli\u003eA teacher instruction page - print and go, nothing to cut or laminate\u003c\/li\u003e\n  \u003cli\u003eEverything bundled as a single download\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\u003eOne printed page holding one crime and the clue lists that solve it. Each clue carries a number beside it, the twelve questions on the page produce those numbers, and a correct answer knocks a clue out. Work to the last array and a single suspect is left standing. Count one row wrong and nothing matches, so the page marks itself.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eWhen to Use This Resource\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cp\u003eUse this when a class can skip count aloud but has not yet seen why the multiplication sign is any use, which is usually late in 1st grade or the first weeks of 2nd. It also works as a gentle way back in for a second grader who has lost confidence with times tables. Reach for it in math centers, morning work, early finishers, homework, sub plans and homeschool lessons, with a whole class, a small group, partners 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 arrays here for the first time, and second graders use the set before formal multiplication facts start.\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\u003eProducts and factors both covered, so the array is read two ways\u003c\/li\u003e\n  \u003cli\u003eA wrong count matches no clue, so students correct themselves\u003c\/li\u003e\n  \u003cli\u003eColor and black and white are both in the download\u003c\/li\u003e\n  \u003cli\u003eThe posters turn a worksheet into a classroom display\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 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":61955298525554,"sku":"7054679","price":4.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0909\/2848\/0626\/files\/early-multiplication-arrays-worksheets-1st-2nd-grade-7054679.jpg?v=1792461392"},{"product_id":"repeated-addition-with-arrays-equal-groups-mystery-detective-worksheets-grades-1-3-printable-detective-pack","title":"Repeated Addition with Arrays \u0026 Equal Groups | Mystery Detective Worksheets | Grades 1–3 | Printable Detective Pack","description":"\u003cp\u003eRepeated addition worksheets for 2nd grade and 3rd grade, with equal groups and arrays on every page: five printable math cases, Mystery Detective style, twenty problems a case. Print and go with full answer keys and a wanted poster set for the wall, no prep, for math centers, morning work, early finishers, homework and sub plans. Students count the groups, read the array and add the same number over and over, each total takes a teacher off the wanted board, and a wrong total matches no clue, so the bridge into multiplication is built without you marking it, from one CSI Mini Mystery Detective download.\u003c\/p\u003e\n\n\u003cp\u003eTwenty identical rows of equal groups is the dullest page in second grade, and hiding them inside a hunt is the only way anyone practices them. The arrays sit beside the groups, which is where the jump to times tables quietly starts, and one case fills a center rotation. Five math pages and one Mystery Detective wanted board cover the block before the first times tables.\u003c\/p\u003e\n\u003cp\u003eStudents count equal groups, read arrays and write repeated addition sentences, then match each total to a clue. The cases move from twos, fives and tens up to threes, sixes and nines. One teacher in the school has turned into a monster, and the totals show who.\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eThe Five Cases\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eCase 1: twos, fives and tens\u003c\/li\u003e\n  \u003cli\u003eCase 2: the same groups with bigger totals\u003c\/li\u003e\n  \u003cli\u003eCase 3: threes and sevens, with arrays\u003c\/li\u003e\n  \u003cli\u003eCase 4: threes, sixes and nines\u003c\/li\u003e\n  \u003cli\u003eCase 5: fours, sixes, eights and nines mixed\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\u003eFive cases, each with a problem page and a clue page\u003c\/li\u003e\n  \u003cli\u003eEqual groups, arrays and repeated addition\u003c\/li\u003e\n  \u003cli\u003eA black and white version\u003c\/li\u003e\n  \u003cli\u003eAnswer keys for all five\u003c\/li\u003e\n  \u003cli\u003eWanted posters and a banner\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\u003eEach case has a problem page and a clue page. Students work out each total and cross off the teacher with that number. The teacher who's left is the monster.\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 after skip counting and before multiplication facts. 3rd graders can use them as a warm-up at the start of the year. The posters make a classroom display. They also work as homework, with small groups and on sub days.\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 2nd grade and 3rd grade.\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\u003eA step from repeated addition to multiplication\u003c\/li\u003e\n  \u003cli\u003eFive cases that get harder\u003c\/li\u003e\n  \u003cli\u003eWanted posters included\u003c\/li\u003e\n  \u003cli\u003eNo prep\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":61955590422898,"sku":"7902696","price":4.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0909\/2848\/0626\/files\/repeated-addition-arrays-and-equal-groups-worksheets-2nd-3rd-grade-7902696.jpg?v=1792462509"},{"product_id":"addition-within-20-winter-digital-escape-room-math-activity-grades-k-2","title":"Addition Within 20 Winter Digital Escape Room | Math Activity | Grades K–2","description":"\u003cp\u003e\u003cstrong\u003eLock the lesson and hand over a link.\u003c\/strong\u003e Your students step into a snowed-in winter world where every frozen lock is really an addition-within-20 problem in disguise. Solve it, reveal the code, and melt your way to the exit.\u003c\/p\u003e\n\u003cp\u003eIt's a no-prep, self-checking review game that runs in any browser — no apps, no logins, no printing. Just send the link and watch them race the clock.\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 digital escape room\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eResource type:\u003c\/strong\u003e No-prep, self-checking review game\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSkill focus:\u003c\/strong\u003e Addition within 20\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\u003eThe mission\u003c\/h3\u003e\n\u003cp\u003eA snowstorm has frozen the cabin doors shut. The only way out is to solve a trail of winter addition puzzles, collect each code, and unlock the final door before the blizzard sets in.\u003c\/p\u003e\n\u003ch3\u003eHow the escape room works\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eOpen the private link — no app or login required.\u003c\/li\u003e\n\u003cli\u003eWork through a series of animated addition challenges.\u003c\/li\u003e\n\u003cli\u003eEach correct answer reveals a code that unlocks the next room.\u003c\/li\u003e\n\u003cli\u003eWrong answers won't open the lock, so the room checks itself.\u003c\/li\u003e\n\u003cli\u003eCrack the final code to escape and win.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eWhat's included\u003c\/h3\u003e\n\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.\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 two numbers with sums to 20\u003c\/li\u003e\n\u003cli\u003eMental math fluency and number bonds\u003c\/li\u003e\n\u003cli\u003eProblem solving under a fun, themed challenge\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, review days, and distance learning.\u003c\/p\u003e","brand":"Kiwiland Education","offers":[{"title":"Default Title","offer_id":61959766573426,"sku":"10793305","price":3.5,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0909\/2848\/0626\/files\/winter-addition-within-20-digital-escape-room-1.jpg?v=1781999773"},{"product_id":"subtraction-within-20-winter-digital-escape-room-math-activity-grades-k-2","title":"Subtraction Within 20 Winter Digital Escape Room | Math Activity | Grades K–2","description":"\u003cp\u003e\u003cstrong\u003eLock the lesson and hand over a link.\u003c\/strong\u003e Your students step into a snowed-in winter world where every frozen lock is really a subtraction-within-20 problem in disguise. Solve it, reveal the code, and melt your way to the exit.\u003c\/p\u003e\n\u003cp\u003eIt's a no-prep, self-checking review game that runs in any browser — no apps, no logins, no printing. Just send the link and watch them race the clock.\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 digital escape room\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eResource type:\u003c\/strong\u003e No-prep, self-checking review game\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSkill focus:\u003c\/strong\u003e Subtraction within 20\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\u003eThe mission\u003c\/h3\u003e\n\u003cp\u003eA snowstorm has frozen the cabin doors shut. The only way out is to solve a trail of winter subtraction puzzles, collect each code, and unlock the final door before the blizzard sets in.\u003c\/p\u003e\n\u003ch3\u003eHow the escape room works\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eOpen the private link — no app or login required.\u003c\/li\u003e\n\u003cli\u003eWork through a series of animated subtraction challenges.\u003c\/li\u003e\n\u003cli\u003eEach correct answer reveals a code that unlocks the next room.\u003c\/li\u003e\n\u003cli\u003eWrong answers won't open the lock, so the room checks itself.\u003c\/li\u003e\n\u003cli\u003eCrack the final code to escape and win.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eWhat's included\u003c\/h3\u003e\n\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.\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\u003eSubtracting within 20\u003c\/li\u003e\n\u003cli\u003eMental math fluency and number bonds\u003c\/li\u003e\n\u003cli\u003eProblem solving under a fun, themed challenge\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, review days, and distance learning.\u003c\/p\u003e","brand":"Kiwiland Education","offers":[{"title":"Default Title","offer_id":61959770931570,"sku":"10793028","price":3.5,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0909\/2848\/0626\/files\/winter-subtraction-within-20-digital-escape-room-1.jpg?v=1782000990"},{"product_id":"multiplication-arrays-mini-mystery-worksheets-grades-2-4-detective-mystery","title":"Multiplication Arrays | Mini Mystery Worksheets | Grades 2–4 | Detective Mystery","description":"\u003cp\u003eMultiplication arrays worksheets for 2nd grade and 3rd grade, ten Mystery Detective style math review pages where students read the rows and columns and write the multiplication. Print and go with full answer keys and no prep, for math centers, morning work, early finishers, homework and sub plans, in color or black and white. Five cases ask for the product and five ask for the factors, so the same array gets read both ways, twelve arrays a page, and each answer crosses off a suspect until the teacher who turned into a monster is the only one left; a miscounted row matches nobody, so the CSI Mini Mystery Detective pack keeps them honest without you.\u003c\/p\u003e\n\n\u003cp\u003eArrays are where repeated addition stops being the quick way and multiplication starts being worth learning, and asking for factors on one page and the product on the next is what makes a class read rows and columns rather than count dots. Ten cases give the idea long enough to hold without ten identical worksheets. Math practice with a Mystery Detective on every page.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eThe Ten Cases\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cul\u003e\n  \u003cli\u003eCases one to five - read the array, write the product\u003c\/li\u003e\n  \u003cli\u003eCases six to ten - read the array, write the factors\u003c\/li\u003e\n  \u003cli\u003eTwelve arrays on every case, each answer knocking out a clue\u003c\/li\u003e\n  \u003cli\u003eRows and columns both change, so nothing can be counted by habit\u003c\/li\u003e\n  \u003cli\u003eOne running story: a teacher in the school has turned into a monster\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003e\u003cstrong\u003eWhat's Inside\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cul\u003e\n  \u003cli\u003eTen case files in full color\u003c\/li\u003e\n  \u003cli\u003eThe same ten cases again in black and white for cheap printing\u003c\/li\u003e\n  \u003cli\u003eAnswer keys for every case\u003c\/li\u003e\n  \u003cli\u003eFive monster wanted posters for the classroom wall\u003c\/li\u003e\n  \u003cli\u003eA wanted poster and banner deck to put the hunt on the wall\u003c\/li\u003e\n  \u003cli\u003eA teacher instruction page - print and go, nothing to cut or laminate\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\u003eOne printed page holding one crime and the clue lists that solve it. Each clue has a number against it, the twelve questions on the page produce those numbers, and a correct answer knocks a clue out. Work to the last array and a single suspect is left standing. Get one wrong and nothing matches, so the page marks itself.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eWhen to Use This Resource\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cp\u003eReach for this in the weeks between skip counting and the first times tables, when a class can add equal groups but has not yet met the multiplication sign in earnest. It works just as well at the start of 3rd grade as revision before facts are pushed for speed. Use it for math centers, morning work, early finishers, homework, sub plans and homeschool lessons, with a whole class, a small group, partners or one student on their own.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eGrade Levels\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cp\u003eWritten for 2nd grade and 3rd grade. Second graders meet arrays here for the first time, and third graders use the set as a warm up before multiplication facts begin.\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\u003eProducts and factors both covered, so the array is read two ways\u003c\/li\u003e\n  \u003cli\u003eA wrong answer matches no clue, so students mark themselves\u003c\/li\u003e\n  \u003cli\u003eColor and black and white are both in the download\u003c\/li\u003e\n  \u003cli\u003eThe posters turn a worksheet into a classroom display\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 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":62005482029426,"sku":"7108958","price":4.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0909\/2848\/0626\/files\/multiplication-arrays-worksheets-2nd-3rd-grade-7108958.jpg?v=1792461675"},{"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":"addition-subtraction-word-problems-within-1000-mystery-detective-worksheets-grades-2-4","title":"Addition \u0026 Subtraction Word Problems Within 1000 | Mystery Detective Worksheets | Grades 2–4","description":"\u003cp\u003eAddition and subtraction word problems within 1000, three-digit story problems, and school-themed math worksheets for 3rd grade are all included in this no-prep Mini Mystery Detective pack. Students solve their way through a page of word problems, use each answer to cross a suspect off the line-up, and the last suspect standing is the culprit — perfect for math centers, morning work, early finishers, substitute and relief days, homework, small-group intervention, and spiral review. Completely no prep — just print and go.\u003c\/p\u003e\n\n\u003cp\u003eUse it as a 3-digit addition and subtraction review, a problem-solving unit warm-up, a no-prep math sub plan, or a station in your math rotations. Every case mixes joining, separating, part-part-whole and comparing situations — how many altogether, how many are left, how many more and how many fewer — so students practice choosing the operation from the story instead of hunting for key words. It fits 2nd grade extension, 3rd grade core instruction, and 4th grade review or intervention.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eWhat's Inside\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cul\u003e\n  \u003cli\u003eAdding three-digit numbers within 1000 with regrouping: 423 + 250, 359 + 363, 110 + 248\u003c\/li\u003e\n  \u003cli\u003eSubtracting three-digit numbers within 1000 with regrouping: 616 - 346, 833 - 409, 923 - 414\u003c\/li\u003e\n  \u003cli\u003eComparison word problems that ask how many more and how many fewer, the ones students most often add by mistake\u003c\/li\u003e\n  \u003cli\u003eChoosing the operation from the situation rather than from key words, so problem solving transfers to new wording\u003c\/li\u003e\n  \u003cli\u003eReading and interpreting real school situations: library books, lunch orders, sports day points, book fair takings and lost property\u003c\/li\u003e\n  \u003cli\u003eSelf-checking suspect line-ups, so a student who slips knows straight away that something has gone wrong\u003c\/li\u003e\n  \u003cli\u003eFull answer keys in red for every case\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eFive school mysteries to crack: the missing library books, the muddled lunch line, the changed sports day score, the missing book fair cash, and the raided lost property pile. 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. It is like an escape room without the locks — the math has to be right for the elimination to work, so skill practice and critical thinking come 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 station rotations\u003c\/li\u003e\n  \u003cli\u003eMorning work and bell ringers\u003c\/li\u003e\n  \u003cli\u003eEarly finishers and fast-finisher folders\u003c\/li\u003e\n  \u003cli\u003eSubstitute and relief day plans\u003c\/li\u003e\n  \u003cli\u003eHomework and independent practice\u003c\/li\u003e\n  \u003cli\u003eSmall-group intervention and re-teaching\u003c\/li\u003e\n  \u003cli\u003eSpiral review and test prep\u003c\/li\u003e\n  \u003cli\u003eIndoor recess and end-of-unit rewards\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 3rd graders working with addition and subtraction within 1000. Also beneficial for struggling 4th and 5th grade students who need extra problem-solving practice, and for advanced 2nd graders ready to move past three-digit computation into word problems.\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 — print and hand out\u003c\/li\u003e\n  \u003cli\u003eCompletely self-checking, so you are not marking every page to know who is on track\u003c\/li\u003e\n  \u003cli\u003eThe detective hook pulls in reluctant and struggling mathematicians\u003c\/li\u003e\n  \u003cli\u003eReal-world school situations build genuine problem solving, not key-word guessing\u003c\/li\u003e\n  \u003cli\u003eOne page per case makes it easy to assign, differentiate and take in\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eLove this resource?\u003c\/p\u003e\n\u003cp\u003eFollow Kiwiland Education to discover more Mystery Detective packs, no-prep math activities, and detective-themed stories for the classroom.\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":62170505019762,"sku":"17212371","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-within-1000-mystery-detective-grade-3-17212371.jpg?v=1792461264"},{"product_id":"multiplication-arrays-and-word-problems-mystery-detective-worksheets-grades-2-3","title":"Multiplication Arrays and Word Problems | Mystery Detective Worksheets | Grades 2–3","description":"\u003cp\u003eMultiplication arrays worksheets, equal groups activities, skip counting practice and multiplication word problems for 2nd grade and 3rd grade are all included in this no-prep Mini Mystery Detective pack of math worksheets. Ten detective cases carry one skill from the very first picture through to word problems with nothing drawn to lean on - perfect for math centers, morning work, early finishers, homework, small groups and review. Completely no prep - just print and go.\u003c\/p\u003e\n\n\u003cp\u003eThis is the stretch of multiplication that decides whether a child ever gets fluent with it: seeing a total as equal groups, then as rows and columns, then recognizing the same thing inside a sentence. Cases 1 to 5 give students the picture. Cases 6 to 10 take it away, and the cases get harder in order, so the same pack carries a class that is not all in the same place.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eWhat's Inside\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cul\u003e\n  \u003cli\u003eEqual groups as a model for multiplication - reading a set of equal trays as a multiplication fact\u003c\/li\u003e\n  \u003cli\u003eArrays across the times table, from small ones a second grader can count up to six rows of nine\u003c\/li\u003e\n  \u003cli\u003eSkip counting on a number line - equal jumps of 2s, 3s, 4s, 5s, 6s, 8s and 10s\u003c\/li\u003e\n  \u003cli\u003eMultiplication word problems in four wordings: equal groups, rows, columns, and how many go in each one\u003c\/li\u003e\n  \u003cli\u003eDeciding from the sentence alone which number is the group and which is the size of it, with 10 x 10 the biggest fact in the pack\u003c\/li\u003e\n  \u003cli\u003eAnswer keys for every case\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eTen cases to solve: The Bakery Trays, The Park Path Hops, The Library Rows, The Market Boxes, The Museum Tiles, The Lost Property, The Fire Drill List, The Farm Shop Eggs, The Harbour Nets and The Sports Day Kit.\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. Skill practice plus critical thinking in one engaging, self-checking worksheet set.\u003c\/p\u003e\n\n\u003cp\u003eThe pages check themselves - a wrong answer stops the mystery in its tracks, so students go back and find their own mistake before it ever reaches your marking pile.\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 bell ringers\u003c\/li\u003e\n  \u003cli\u003eEarly finishers and fast workers\u003c\/li\u003e\n  \u003cli\u003eIndependent practice and homework\u003c\/li\u003e\n  \u003cli\u003eSub days and emergency plans\u003c\/li\u003e\n  \u003cli\u003eSmall group work and intervention\u003c\/li\u003e\n  \u003cli\u003eReview before a multiplication unit test\u003c\/li\u003e\n  \u003cli\u003eThe week you introduce arrays, and the weeks after it\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 and 3rd graders. The early picture cases also suit advanced 1st graders, and the word problem cases give a struggling 4th grader a way back into multiplication without handing them work that looks younger than they are.\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 - print one page per student and hand it out\u003c\/li\u003e\n  \u003cli\u003eSelf-checking, so students find their own mistakes instead of waiting for you\u003c\/li\u003e\n  \u003cli\u003ePrints clean in black and white\u003c\/li\u003e\n  \u003cli\u003eOne skill, ten different pages - no page is the same worksheet twice\u003c\/li\u003e\n  \u003cli\u003eA detective hook that holds the students who groan at a worksheet\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eLove this resource?\u003c\/p\u003e\n\u003cp\u003eFollow Kiwiland Education to discover more Mystery Detective packs, no-prep math activities, and detective-themed stories for the classroom.\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":62264571560306,"sku":"17499368","price":4.5,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0909\/2848\/0626\/files\/multiplication-arrays-worksheets-3rd-grade-mystery-detective-equal-groups-2nd-grade-17499368.jpg?v=1792461674"},{"product_id":"addition-and-subtraction-within-20-mystery-detective","title":"Addition and Subtraction Within 20 | Mystery Detective | Grades 1–2 | Halloween","description":"\u003cp\u003e1st grade addition and subtraction within 20, written to 1.OA.C.6. Students add and subtract on the question cards, then use each answer to strike a suspect off the sheet until one name is left, which gives you math worksheets and math activities from one no prep download. A Halloween CSI Mystery Detective math case run as SCOOT task cards around the room, with Halloween math for October, then math centers, early finishers, homework, morning work, sub plans, test prep and review for the rest of the year. CSI math in color and black and white versions, with a full answer key and detective activities that need no prep.\u003c\/p\u003e\n\n\u003cp\u003e\u003c!--LEAD--\u003eFirst graders will do far more addition and subtraction on their feet than they will sitting down, and this is the resource that takes advantage of it. The cards go around the room, each answer takes a suspect off their sheet, and finding the culprit is the reward. Short enough that the whole class finishes together, and it is ready for early finishers any time after that.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eGhostly Giggles\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cp\u003eSomething is laughing in the dark and the class is out to find it. Students move around the room card by card, and every answer they work out crosses another suspect off the sheet they are carrying. By the time the last card is done, only one name is left.\u003c\/p\u003e\n\n\n\n\n\u003cp\u003e\u003cstrong\u003eWhat's Inside\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cul\u003e\n  \u003cli\u003eEleven numbered question cards, written to 1.OA.C.6\u003c\/li\u003e\n  \u003cli\u003eAddition and subtraction within 20 on every card\u003c\/li\u003e\n  \u003cli\u003eA suspect sheet each student fills in as they move around the room\u003c\/li\u003e\n  \u003cli\u003eA color set and a black and white set of the same cards\u003c\/li\u003e\n  \u003cli\u003eThe answer key, with the culprit named\u003c\/li\u003e\n  \u003cli\u003ePrint, cut the cards once, and it is ready every year after that\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\n\n\n\u003cp\u003e\u003cstrong\u003eWhat Is a CSI Mystery Detective?\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cp\u003eA CSI Mystery Detective gives your class a crime, a lineup of suspects and a set of questions, and the only route to the culprit is the math. Each suspect wears a number, each correct answer matches one of them, and that name is crossed off until one has not been ruled out. Run as SCOOT the questions go on the wall and students travel between them, which is what separates these detective activities from ordinary math worksheets. One case fills a class period with no prep.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eWhen to Use This Resource\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cp\u003eUse this in the last week of October, when nobody is sitting still and you still have facts within 20 on the plan. It gets first graders moving between cards instead of grinding down a worksheet, and the number of problems is small enough that the whole class finishes in one session. Each answer strikes a name off their own sheet, so a wrong sum shows itself before you ever look at the page.\u003c\/p\u003e\n\n\u003cp\u003eIt covers test prep, homework, math centers, morning work, early finishers, sub plans and homeschool lessons, with a whole class, a small group or one child working alone.\u003c\/p\u003e\n\n\n\n\n\u003cp\u003e\u003cstrong\u003eGrade Levels\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cp\u003eWritten for 1st grade, where 1.OA.C.6 sits. Kindergarten classes take it late in the year once addition within 10 is secure, and second graders use it as a start of year warm up before moving to within 100.\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\u003eEleven short questions, which is the right length for a first grade attention span\u003c\/li\u003e\n  \u003cli\u003eStudents check themselves as the suspects come off the sheet\u003c\/li\u003e\n  \u003cli\u003eOne cut and the cards are ready for every October after this one\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\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":62593085407602,"sku":"10279129","price":4.0,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0909\/2848\/0626\/files\/first-grade-fact-fluency-1-oa-c-6-detective-game.jpg?v=1792612678"},{"product_id":"addition-and-subtraction-within-20-mystery-detective-mischievous-magician","title":"Addition and Subtraction Within 20 | Mystery Detective | Grades 1–2","description":"\u003cp\u003eA sub folder, a math center and an early finisher task in one file: a CSI Mystery Detective math case that runs as SCOOT task cards around the room, on addition and subtraction within 20 for 1st grade. Written to 1.OA.C.6, so students add and subtract on the question cards, then strike a suspect off the sheet until one name is left, which gives you math worksheets and math activities from one no prep download. Nothing in it is seasonal, so it runs from back to school in August through to the end of year. Color and black and white versions, with a full answer key and detective activities that get your class moving.\u003c\/p\u003e\n\n\u003cp\u003e\u003c!--LEAD--\u003eStudents will happily do a whole session of math facts if they are on their feet and there is a culprit at the end of it. The cards go up around the room, each answer takes a suspect off the sheet, and the class works its way round. Cut them once and you have an activity for every year after this one, ready for early finishers too.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eThe Mischievous Magician\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cp\u003eThe magician is up to something and the class has been called in. Students move from card to card, and each answer they solve rules out another suspect on the sheet they carry. The last name left when every card is done is the one behind it all.\u003c\/p\u003e\n\n\n\n\n\u003cp\u003e\u003cstrong\u003eWhat's Inside\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cul\u003e\n  \u003cli\u003eEleven numbered question cards to put up around the room\u003c\/li\u003e\n  \u003cli\u003eAddition and subtraction within 20, written to 1.OA.C.6\u003c\/li\u003e\n  \u003cli\u003eA suspect sheet each student carries and crosses names off as they go\u003c\/li\u003e\n  \u003cli\u003eA color set and a black and white set of the same cards\u003c\/li\u003e\n  \u003cli\u003eThe answer key, with the culprit named\u003c\/li\u003e\n  \u003cli\u003ePrint, cut the cards once, and the set is ready for good\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\n\n\n\u003cp\u003e\u003cstrong\u003eWhat Is a CSI Mystery Detective?\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cp\u003eA CSI Mystery Detective gives your class a crime, a lineup and a set of questions, and the only route to the culprit runs through the math. Each suspect wears a number, each correct answer matches one of them, and that name is struck off until a single suspect has not been ruled out. Run as SCOOT the questions go on the wall and students travel between them, which is what separates detective activities from a page of math worksheets. One case fills 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\u003eReach for this when the facts within 20 need another run and nobody will sit through a third worksheet. Sending students around the room turns the same eleven questions into a lesson they finish, and the suspect sheet makes each one matter because a wrong sum takes out the wrong person. It is also the folder to leave behind when you are out for the day.\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 child alone.\u003c\/p\u003e\n\n\n\n\n\u003cp\u003e\u003cstrong\u003eGrade Levels\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cp\u003eWritten for 1st grade, where 1.OA.C.6 sits in the standards. Kindergarten classes take it late in the year once addition within 10 is secure, and second graders use it as a start of year warm up before moving on to within 100.\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\u003eStudents are up and moving, which keeps first graders working\u003c\/li\u003e\n  \u003cli\u003eThe suspect sheet flushes out a wrong answer without you checking it\u003c\/li\u003e\n  \u003cli\u003eOne cut and the cards last for years\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\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":62593085473138,"sku":"9341122","price":4.0,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0909\/2848\/0626\/files\/addition-and-subtraction-within-20-scoot-task-cards_2f40c55a-9789-4cbd-b20c-11f511b8665c.jpg?v=1792612683"}],"url":"https:\/\/kiwilandeducation.com\/collections\/math-2-oa.oembed","provider":"Kiwiland Education","version":"1.0","type":"link"}