{"title":"Valentine's Day Activities","description":"\u003cp\u003e\u003cstrong\u003eValentine's Day math mysteries, reading mysteries and escape rooms\u003c\/strong\u003e for February. The kindness cards case, the Valentine's surprise and more: every right answer eliminates a suspect, so the class self-checks and you get the afternoon back.\u003c\/p\u003e\u003cp\u003eBrowse by format: \u003ca href=\"\/collections\/math-mystery\"\u003eMath Mysteries\u003c\/a\u003e, \u003ca href=\"\/collections\/csi-math-mysteries\"\u003eCSI Math Mysteries\u003c\/a\u003e, \u003ca href=\"\/collections\/reading-mysteries\"\u003eReading Mysteries\u003c\/a\u003e, \u003ca href=\"\/collections\/escape-rooms-valentines-day\"\u003eValentine's Day Escape Rooms\u003c\/a\u003e.\u003c\/p\u003e","products":[{"product_id":"valentines-day-csi-math-mystery-grades-3-5","title":"Valentine’s Day CSI Math Mystery Worksheets | Grades 2–5 | Love Bug Wizard","description":"\u003c!-- HOOK --\u003e\n\u003cp\u003eTurn February math review into a detective investigation your students won't want to put down. This printable \u003cstrong\u003eValentine’s Day CSI Math Mystery\u003c\/strong\u003e is designed for \u003cstrong\u003eGrades 2–5 classroom teachers, homeschool parents, and tutors\u003c\/strong\u003e who want focused math practice wrapped in a story students actually care about solving.\u003c\/p\u003e\n\n\u003cp\u003eStudents work through a series of clue pages, use their answers to eliminate suspects, and race to crack the case — all while getting meaningful practice with addition, subtraction, multiplication, and problem solving. No apps, no prep, no fuss.\u003c\/p\u003e\n\n\u003c!-- QUICK DETAILS --\u003e\n\u003ch3\u003eQuick Details\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eGrade Levels:\u003c\/strong\u003e Grades 2–5 (best for Grades 3–4)\u003cbr\u003e\n\u003cstrong\u003eFormat:\u003c\/strong\u003e Printable PDF\u003cbr\u003e\n\u003cstrong\u003eResource Type:\u003c\/strong\u003e CSI Math Mystery worksheets\u003cbr\u003e\n\u003cstrong\u003eMath Skills:\u003c\/strong\u003e Addition with regrouping, subtraction from 100, and multiplication (multiples of 10 and facts)\u003cbr\u003e\n\u003cstrong\u003ePages:\u003c\/strong\u003e 16 pages including answer key\u003cbr\u003e\n\u003cstrong\u003eBest For:\u003c\/strong\u003e Math centers, sub plans, early finishers, review, small groups, and homeschool math\u003cbr\u003e\n\u003cstrong\u003eTech Needed:\u003c\/strong\u003e None — no apps, locks, passwords, or student logins required\u003c\/p\u003e\n\n\u003c!-- CASE SUMMARY --\u003e\n\u003ch3\u003eCase Summary\u003c\/h3\u003e\n\u003cp\u003eIt is Valentine's Day, and the school is buzzing with kindness and excitement — until something very strange starts happening. A mysterious wizard was spotted at the school gate, muttering spells. Now brightly colored love bugs are flitting through the hallways. Could they be enchanted students?\u003c\/p\u003e\n\u003cp\u003eAs CSI Math Investigators, your students solve a series of math puzzles to gather evidence and work out which suspect is really the Love Bug Wizard. Each correct answer helps them rule a suspect out.\u003c\/p\u003e\n\u003cp\u003eWith every solved clue, the suspect list shrinks — one name cleared here, another there — until only the true wizard behind the spell is left.\u003c\/p\u003e\n\u003cp\u003eCan your investigators crack the clues, unmask the wizard, and reverse the spell before the whole school is bugged? Sharpen those pencils and solve the Love Bug mystery.\u003c\/p\u003e\n\n\u003c!-- SKILLS COVERED --\u003e\n\u003ch3\u003eSkills Covered\u003c\/h3\u003e\n\u003cp\u003eStudents will practice:\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003e3-digit addition with regrouping\u003c\/li\u003e\n  \u003cli\u003eAdding multiple addends\u003c\/li\u003e\n  \u003cli\u003e2-digit subtraction from 100\u003c\/li\u003e\n  \u003cli\u003eMultiplying multiples of 10 (e.g., 30 × 9)\u003c\/li\u003e\n  \u003cli\u003eMultiplication facts (maze)\u003c\/li\u003e\n  \u003cli\u003eUsing answers to eliminate suspects\u003c\/li\u003e\n  \u003cli\u003eLogic, reasoning, and problem solving\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003c!-- WHAT'S INCLUDED --\u003e\n\u003ch3\u003eWhat's Included\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003eCSI-style Valentine’s Day math mystery activity\u003c\/li\u003e\n  \u003cli\u003eMath puzzle clue worksheets\u003c\/li\u003e\n  \u003cli\u003eSuspect elimination chart\u003c\/li\u003e\n  \u003cli\u003eAnswer key\u003c\/li\u003e\n  \u003cli\u003ePrint-and-go PDF format\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003c!-- BEST USED FOR --\u003e\n\u003ch3\u003eBest Used For\u003c\/h3\u003e\n\u003cp\u003eThis printable CSI Math Mystery works well for:\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eValentine’s Day and February math activities\u003c\/li\u003e\n  \u003cli\u003eHoliday math centers and partner work\u003c\/li\u003e\n  \u003cli\u003eSpiral review and early finishers\u003c\/li\u003e\n  \u003cli\u003eSubstitute teacher plans\u003c\/li\u003e\n  \u003cli\u003eSmall groups, RTI, and intervention\u003c\/li\u003e\n  \u003cli\u003eHomeschool math\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Kiwiland Education","offers":[{"title":"Default Title","offer_id":52347043217778,"sku":"5146409","price":4.5,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0909\/2848\/0626\/files\/ValentinesDayMathMystery1.webp?v=1750992458"},{"product_id":"4-digit-subtraction-with-regrouping-math-mystery-worksheets-grades-3-5-valentines-day","title":"4-Digit Subtraction with Regrouping | Math Mystery Worksheets | Grades 3–5 | Valentine's Day","description":"\u003cp\u003e\u003cstrong\u003e4-digit subtraction with regrouping turns into a detective case students actually want to solve\u003c\/strong\u003e — they work through each problem, match every answer to a clue, and eliminate suspects until the case is cracked. This no-prep, printable, self-checking Math Mystery keeps 3rd, 4th, and 5th graders engaged and works perfectly for math centers, morning work, homework, early finishers, substitute\/relief days, indoor recess, spiral review, and test prep. Just print and go — students solve, match the answer to a clue, cross off suspects, and reveal the answer.\u003c\/p\u003e\n\n\u003ch3\u003eQuick Details\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eSkill:\u003c\/strong\u003e 4-digit subtraction with regrouping · \u003cstrong\u003eGrades:\u003c\/strong\u003e 3–5 · \u003cstrong\u003eFormat:\u003c\/strong\u003e 5 mysteries + full answer keys + congratulations page (printable PDF) · \u003cstrong\u003eTheme:\u003c\/strong\u003e Valentine's Day\u003c\/p\u003e\n\n\u003ch3\u003eThe 5 Mysteries\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eBunch of Flowers\u003c\/strong\u003e — Someone has left a bunch of flowers on the teacher's desk and students work out who they are from.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eValentine's Day Card\u003c\/strong\u003e — Someone has been leaving cards on everyone's desks and students work out who the cards are from.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eValentine's Day Flowers\u003c\/strong\u003e — A bunch of flowers has been left for the teacher and students work out who they are from.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eLove Songs\u003c\/strong\u003e — Someone has been heard singing love songs and students work out who it is.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eMystery Bouquet\u003c\/strong\u003e — A bouquet has been left for a teacher but the label has fallen off and students work out who it is for.\u003c\/p\u003e\n\n\u003ch3\u003eWhy Teachers Love It\u003c\/h3\u003e\n\u003cp\u003eZero prep — print and teach. The built-in answer keys make every mystery self-checking, so students get instant feedback and stay motivated. The detective hook pulls in reluctant and struggling learners, and the differentiated versions make it easy to reuse or stretch the activity across the week.\u003c\/p\u003e\n\n\u003ch3\u003eSkills Covered\u003c\/h3\u003e\n\u003cp\u003e4-digit subtraction with regrouping (borrowing), plus logical reasoning and deductive elimination as students rule suspects out clue by clue.\u003c\/p\u003e\n\n\u003ch3\u003eWhat's Included\u003c\/h3\u003e\n\u003cp\u003e5 printable one-page mystery worksheets, complete answer keys for every mystery, student instructions and a congratulations page — all in one PDF.\u003c\/p\u003e\n\n\u003ch3\u003eBest Used For\u003c\/h3\u003e\n\u003cp\u003e4-digit subtraction with regrouping practice in math centers, morning work, homework, early finishers, substitute\/relief days, indoor recess, spiral review, and test prep for grades 3–5.\u003c\/p\u003e","brand":"Kiwiland Education","offers":[{"title":"Default Title","offer_id":61955456237938,"sku":"5148796","price":4.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0909\/2848\/0626\/files\/valentines-day-4-digit-subtraction-math-mystery-1.jpg?v=1781834879"},{"product_id":"3-digit-addition-with-regrouping-math-mystery-worksheets-grades-2-4-valentines-day","title":"3-Digit Addition with Regrouping | Math Mystery Worksheets | Grades 2–4 | Valentine's Day","description":"\u003cp\u003e\u003cstrong\u003e3-digit addition with regrouping turns into a detective case students actually want to solve\u003c\/strong\u003e — they work through each problem, match every answer to a clue, and eliminate suspects until the case is cracked. This no-prep, printable, self-checking Math Mystery keeps 2nd, 3rd, and 4th graders engaged and works perfectly for math centers, morning work, homework, early finishers, substitute\/relief days, indoor recess, spiral review, and test prep. Just print and go — students solve, match the answer to a clue, cross off suspects, and reveal the answer.\u003c\/p\u003e\n\n\u003ch3\u003eQuick Details\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eSkill:\u003c\/strong\u003e 3-digit addition with regrouping · \u003cstrong\u003eGrades:\u003c\/strong\u003e 2–4 · \u003cstrong\u003eFormat:\u003c\/strong\u003e 5 mysteries + full answer keys + congratulations page (printable PDF) · \u003cstrong\u003eTheme:\u003c\/strong\u003e Valentine's Day\u003c\/p\u003e\n\n\u003ch3\u003eThe 5 Mysteries\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eValentine's Dinner Surprise\u003c\/strong\u003e — A surprise dinner has been organised but nobody knows who it is for or where and students work out who the dinner is for.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eValentine's Gift\u003c\/strong\u003e — A secret Valentine's gift has been left on the teacher's desk and students work out who the gift is from.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eShowing Mindfulness\u003c\/strong\u003e — Someone has been doing random acts of kindness around the school and students work out who it is.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eValentine's Day Card\u003c\/strong\u003e — Someone has been leaving cards on everyone's desks and students work out who the cards are from.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eValentine Flowers\u003c\/strong\u003e — A bunch of flowers has been left on the teacher's desk and students work out who the flowers are from.\u003c\/p\u003e\n\n\u003ch3\u003eWhy Teachers Love It\u003c\/h3\u003e\n\u003cp\u003eZero prep — print and teach. The built-in answer keys make every mystery self-checking, so students get instant feedback and stay motivated. The detective hook pulls in reluctant and struggling learners, and the five separate one-page mysteries make it easy to differentiate or stretch the activity across the week.\u003c\/p\u003e\n\n\u003ch3\u003eSkills Covered\u003c\/h3\u003e\n\u003cp\u003e3-digit addition with regrouping (carrying), plus logical reasoning and deductive elimination as students rule suspects out clue by clue.\u003c\/p\u003e\n\n\u003ch3\u003eWhat's Included\u003c\/h3\u003e\n\u003cp\u003e5 printable one-page mystery worksheets, complete answer keys for every mystery, student instructions and a congratulations page — all in one PDF.\u003c\/p\u003e\n\n\u003ch3\u003eBest Used For\u003c\/h3\u003e\n\u003cp\u003e3-digit addition with regrouping practice in math centers, morning work, homework, early finishers, substitute\/relief days, indoor recess, spiral review, and test prep for grades 2–4.\u003c\/p\u003e","brand":"Kiwiland Education","offers":[{"title":"Default Title","offer_id":61955550740850,"sku":"5158427","price":4.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0909\/2848\/0626\/files\/valentines-day-3-digit-addition-math-mystery-1.jpg?v=1781855393"},{"product_id":"3-digit-subtraction-with-regrouping-math-mystery-worksheets-grades-2-4-valentines-day","title":"3-Digit Subtraction with Regrouping | Math Mystery Worksheets | Grades 2–4 | Valentine's Day","description":"\u003cp\u003e\u003cstrong\u003e3-digit subtraction with regrouping turns into a detective case students actually want to solve\u003c\/strong\u003e — they work through each problem, match every answer to a clue, and eliminate suspects until the case is cracked. This no-prep, printable, self-checking Math Mystery keeps 2nd, 3rd, and 4th graders engaged and works perfectly for math centers, morning work, homework, early finishers, substitute\/relief days, indoor recess, spiral review, and test prep. Just print and go — students solve, match the answer to a clue, cross off suspects, and reveal the answer.\u003c\/p\u003e\n\n\u003ch3\u003eQuick Details\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eSkill:\u003c\/strong\u003e 3-digit subtraction with regrouping · \u003cstrong\u003eGrades:\u003c\/strong\u003e 2–4 · \u003cstrong\u003eFormat:\u003c\/strong\u003e 5 mysteries + full answer keys + congratulations page (printable PDF) · \u003cstrong\u003eTheme:\u003c\/strong\u003e Valentine's Day\u003c\/p\u003e\n\n\u003ch3\u003eThe 5 Mysteries\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eChocolate Surprise\u003c\/strong\u003e — Someone has left a box of chocolates on the teacher's desk and students work out who the chocolates are from.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eFriend's Valentine's Card\u003c\/strong\u003e — A card has been left on your friend's desk and students work out who the card is from.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eActs of Kindness\u003c\/strong\u003e — Someone has been doing random acts of kindness around the school and students work out who it is.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eSinging Love Songs\u003c\/strong\u003e — Someone has been heard singing love songs and students work out who it is.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eBouquet of Flowers\u003c\/strong\u003e — A bunch of flowers has been left for the teacher and students work out who the flowers are from.\u003c\/p\u003e\n\n\u003ch3\u003eWhy Teachers Love It\u003c\/h3\u003e\n\u003cp\u003eZero prep — print and teach. The built-in answer keys make every mystery self-checking, so students get instant feedback and stay motivated. The detective hook pulls in reluctant and struggling learners, and the differentiated versions make it easy to reuse or stretch the activity across the week.\u003c\/p\u003e\n\n\u003ch3\u003eSkills Covered\u003c\/h3\u003e\n\u003cp\u003e3-digit subtraction with regrouping (borrowing), plus logical reasoning and deductive elimination as students rule suspects out clue by clue.\u003c\/p\u003e\n\n\u003ch3\u003eWhat's Included\u003c\/h3\u003e\n\u003cp\u003e5 printable one-page mystery worksheets, complete answer keys for every mystery, student instructions and a congratulations page — all in one PDF.\u003c\/p\u003e\n\n\u003ch3\u003eBest Used For\u003c\/h3\u003e\n\u003cp\u003e3-digit subtraction with regrouping practice in math centers, morning work, homework, early finishers, substitute\/relief days, indoor recess, spiral review, and test prep for grades 2–4.\u003c\/p\u003e","brand":"Kiwiland Education","offers":[{"title":"Default Title","offer_id":61955572466034,"sku":"5167917","price":4.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0909\/2848\/0626\/files\/valentines-day-3-digit-subtraction-math-mystery-1.jpg?v=1781855869"},{"product_id":"valentines-day-reading-mystery-worksheets-grades-3-6-the-kindness-cards-case","title":"Valentine's Day | Reading Mystery Worksheets | Grades 3–6 | The Kindness Cards Case","description":"\u003cp\u003eSpread a little kindness and crack the case this Valentine's Day. This printable \u003cstrong\u003eValentine's Day Reading Mystery\u003c\/strong\u003e turns a heart-warming story into a reading-detective investigation for \u003cstrong\u003eGrades 3–6 classroom teachers, homeschoolers, and tutors\u003c\/strong\u003e. It drops straight into a Valentine's Day, February, or kindness lesson and gets students reading carefully to solve it.\u003c\/p\u003e\n\u003cp\u003eStudents gather evidence straight from the passage, ruling out suspects one answer at a time until the culprit is all that's left. No prep, no logins.\u003c\/p\u003e\n\u003ch3\u003eQuick Details\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eGrade Levels:\u003c\/strong\u003e Grades 3–6\u003cbr\u003e\n\u003cstrong\u003eFormat:\u003c\/strong\u003e Printable PDF\u003cbr\u003e\n\u003cstrong\u003eResource Type:\u003c\/strong\u003e Reading Mystery worksheets\u003cbr\u003e\n\u003cstrong\u003eReading Skills:\u003c\/strong\u003e Fiction comprehension, story elements, text evidence, inference, and vocabulary\u003cbr\u003e\n\u003cstrong\u003eTech Needed:\u003c\/strong\u003e None — no apps, locks, passwords, or student logins required\u003c\/p\u003e\n\u003ch3\u003eThe Case\u003c\/h3\u003e\n\u003cp\u003eThe class kindness cards have gone missing this Valentine's Day, and a line-up of suspects is waiting. 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Identify each type correctly and the codes reveal themselves, one puzzle at a time.\u003c\/p\u003e\u003ch3\u003eHow the escape room works\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eOpen the private link in any browser — no app, login, or subscription\u003c\/li\u003e\n\u003cli\u003eSolve each figurative-language challenge to reveal a code\u003c\/li\u003e\n\u003cli\u003eEnter the code to unlock the next stage — wrong answers won't open it\u003c\/li\u003e\n\u003cli\u003eThe room self-checks, so students get instant feedback\u003c\/li\u003e\n\u003cli\u003eCrack the final code to escape\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eWhat's included\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eAn interactive digital escape room hosted on a private site\u003c\/li\u003e\n\u003cli\u003eAnimated, self-checking puzzles 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 with your private access link to share via Google Classroom, email, or your LMS\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eSkills covered\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eIdentifying similes, metaphors, and personification\u003c\/li\u003e\n\u003cli\u003eRecognizing idioms and hyperbole\u003c\/li\u003e\n\u003cli\u003eInterpreting meaning in context\u003c\/li\u003e\n\u003cli\u003eClose reading of figurative language\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eBest used for\u003c\/h3\u003e\u003cp\u003eLiteracy centers, tech time, early finishers, sub plans, Valentine's Day and February review, test prep, homeschool, and distance learning.\u003c\/p\u003e","brand":"Kiwiland Education","offers":[{"title":"Default Title","offer_id":61958409552242,"sku":"12974777","price":4.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0909\/2848\/0626\/files\/valentines-day-figurative-language-digital-escape-room-1.jpg?v=1781989984"},{"product_id":"addition-subtraction-csi-math-mystery-worksheets-grades-2-5-the-valentines-surprise-card","title":"Addition \u0026 Subtraction CSI Math Mystery Worksheets | Grades 2–5 | The Valentine's Surprise Card","description":"\u003cp\u003eA mystery Valentine's card has turned up inside a student's desk, and nobody will admit who left it. 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The bell rings, they open their desks to grab their math books — and instead find an envelope with their name on it. Someone has left a secret valentine, and no one is owning up to it.\u003c\/p\u003e\n\u003cp\u003eGood thing your students are the chief inspectors for C.S.I. — Crime Scene Investigation. They tape off the desk, secure the surrounding area, and round up every suspect in the room. The only way to identify the secret admirer is to work the math.\u003c\/p\u003e\n\u003cp\u003eClue by clue, students add and subtract their way through the evidence: two- and three-digit problems with regrouping, more-and-less puzzles, true-or-false equations, and multiple addends. Each correct answer clears another name from the list until only one suspect is left holding the secret.\u003c\/p\u003e\n\u003cp\u003eHand your students the evidence, point them at the suspects, and let them prove they can crack the case. The math is the only thing standing between them and the truth.\u003c\/p\u003e\n\u003ch3\u003eSkills Covered\u003c\/h3\u003e\n\u003cp\u003eStudents will practice:\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003e2-digit addition and subtraction with regrouping\u003c\/li\u003e\n  \u003cli\u003e3-digit addition and subtraction with regrouping\u003c\/li\u003e\n  \u003cli\u003e10 more\/10 less, 100 more\/100 less, and 1,000 more\/1,000 less\u003c\/li\u003e\n  \u003cli\u003eAdding multiple addends\u003c\/li\u003e\n  \u003cli\u003eTrue or false addition equations\u003c\/li\u003e\n  \u003cli\u003eUsing answers to eliminate suspects\u003c\/li\u003e\n  \u003cli\u003eLogic, reasoning, and problem solving\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eWhat's Included\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003eCSI-style math mystery activity\u003c\/li\u003e\n  \u003cli\u003eAddition and subtraction clue pages\u003c\/li\u003e\n  \u003cli\u003eMore-and-less and true-or-false puzzles\u003c\/li\u003e\n  \u003cli\u003eSuspect elimination activity\u003c\/li\u003e\n  \u003cli\u003eAnswer key\u003c\/li\u003e\n  \u003cli\u003ePrint-and-go PDF format\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eBest Used For\u003c\/h3\u003e\n\u003cp\u003eThis printable CSI Math Mystery works well for:\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eValentine's Day and February math activities\u003c\/li\u003e\n  \u003cli\u003eMath centers and early finishers\u003c\/li\u003e\n  \u003cli\u003eSubstitute teacher plans\u003c\/li\u003e\n  \u003cli\u003eSmall groups and independent work\u003c\/li\u003e\n  \u003cli\u003eHomeschool math\u003c\/li\u003e\n  \u003cli\u003eReview and reinforcement\u003c\/li\u003e\n  \u003cli\u003eAddition and subtraction practice\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Kiwiland Education","offers":[{"title":"Default Title","offer_id":61981846864242,"sku":"3607787","price":4.5,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0909\/2848\/0626\/files\/valentines-day-csi-math-mystery-addition-subtraction-grades-2-5-cover.jpg?v=1782501401"},{"product_id":"2-digit-addition-with-regrouping-math-mystery-worksheets-grades-1-3-valentines-day","title":"2-Digit Addition with Regrouping | Math Mystery Worksheets | Grades 1–3 | Valentine's Day","description":"\u003cp\u003e\u003cstrong\u003e2-digit addition with regrouping turns into a Valentine's Day detective hunt your students will beg to finish.\u003c\/strong\u003e In this no-prep, printable \u003cstrong\u003eMath Mystery\u003c\/strong\u003e, young investigators solve two-digit column addition problems, match each answer to a clue, and eliminate suspects one by one until only the culprit remains. The self-checking format keeps 1st, 2nd, and 3rd graders locked in from the first sum to the last while they build real fluency adding two-digit numbers with regrouping (carrying). Five story-driven Valentine's cases make addition practice feel like a sweetheart whodunit — perfect for math centers, morning work, homework, early finishers, substitute days, indoor recess, spiral review, and Valentine's Day–themed math days.\u003c\/p\u003e\n\n\u003ch3\u003eQuick Details\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSkill:\u003c\/strong\u003e 2-digit addition with regrouping (carrying)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eGrades:\u003c\/strong\u003e 1–3 (1st, 2nd, 3rd)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFormat:\u003c\/strong\u003e 5 no-prep printable mystery worksheets + full answer keys + a themed congratulations page (PDF)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTheme:\u003c\/strong\u003e Valentine's Day detective adventure\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eThe 5 Mysteries\u003c\/h3\u003e\n\u003cp\u003eEach case is a self-contained addition worksheet where students solve the sums, match answers to clues, and cross off suspects until the mystery is cracked:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eFlowers for the Teacher\u003c\/strong\u003e — A bunch of flowers has been left for the teacher with no card attached. Solve the sums to reveal who they are from, when, where they were left, and the type of flowers.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eValentine Songs\u003c\/strong\u003e — A box of chocolates has appeared on the teacher's desk from a secret admirer. Add your way through the clues to discover who, when, their vocal range, and song genre.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUn-named Flowers\u003c\/strong\u003e — A bouquet has arrived for a teacher but the name label has fallen off. Work the addition to figure out which teacher the flowers are for.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMindfulness Practice\u003c\/strong\u003e — Someone has been quietly showing mindfulness in class and no one knows who. Solve each problem to uncover who, when, the mindful act, and their reward.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eValentine's Day Card\u003c\/strong\u003e — A card has turned up on a friend's desk from a secret sender. Add to reveal who sent it, when, and its envelope and pen colour.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhy Teachers Love It\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eZero prep\u003c\/strong\u003e — just print and hand out; every case is a single self-contained page.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSelf-checking\u003c\/strong\u003e — the suspect-elimination format means students catch their own errors and stay accountable.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eEngagement that lasts\u003c\/strong\u003e — the detective story pulls in even reluctant and struggling mathematicians.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDifferentiation-friendly\u003c\/strong\u003e — use one case at a time or the full set; ideal for mixed-ability classrooms.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eSkills Covered\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eAdding two-digit numbers with regrouping \/ carrying\u003c\/li\u003e\n\u003cli\u003eColumn addition accuracy and place value\u003c\/li\u003e\n\u003cli\u003eFluency and mental-math confidence\u003c\/li\u003e\n\u003cli\u003eLogical reasoning and deductive process of elimination\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhat's Included\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e5 print-and-go mystery worksheets (one per case)\u003c\/li\u003e\n\u003cli\u003eFull answer keys for every case\u003c\/li\u003e\n\u003cli\u003eStudent detective instructions\u003c\/li\u003e\n\u003cli\u003eA themed Valentine's Day congratulations page\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eBest Used For\u003c\/h3\u003e\n\u003cp\u003eMath centers and rotations, independent practice, morning work, homework, early finishers, substitute\/relief days, indoor recess, spiral review, test prep, and Valentine's Day–themed math days — any time you want 2-digit addition practice that feels like a game.\u003c\/p\u003e","brand":"Kiwiland Education","offers":[{"title":"Default Title","offer_id":62008105304434,"sku":"5168793","price":4.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0909\/2848\/0626\/files\/2-digit-addition-with-regrouping-math-mystery-valentines-day-cover.jpg?v=1783290521"},{"product_id":"2-digit-subtraction-with-regrouping-math-mystery-worksheets-grades-1-3-valentines-day","title":"2-Digit Subtraction with Regrouping | Math Mystery Worksheets | Grades 1–3 | Valentine's Day","description":"\u003cp\u003e\u003cstrong\u003e2-digit subtraction with regrouping turns into a Valentine's Day detective hunt your students will beg to finish.\u003c\/strong\u003e In this no-prep, printable \u003cstrong\u003eMath Mystery\u003c\/strong\u003e, young investigators solve two-digit column subtraction problems, match each answer to a clue, and eliminate suspects one by one until only the culprit remains. The self-checking format keeps 1st, 2nd, and 3rd graders locked in from the first difference to the last while they build real fluency subtracting two-digit numbers with regrouping (borrowing). Five story-driven Valentine's cases make subtraction practice feel like a sweetheart whodunit — perfect for math centers, morning work, homework, early finishers, substitute days, indoor recess, spiral review, and Valentine's Day–themed math days.\u003c\/p\u003e\n\n\u003ch3\u003eQuick Details\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSkill:\u003c\/strong\u003e 2-digit subtraction with regrouping (borrowing)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eGrades:\u003c\/strong\u003e 1–3 (1st, 2nd, 3rd)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFormat:\u003c\/strong\u003e 5 no-prep printable mystery worksheets + full answer keys + a themed congratulations page (PDF)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTheme:\u003c\/strong\u003e Valentine's Day detective adventure\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eThe 5 Mysteries\u003c\/h3\u003e\n\u003cp\u003eEach case is a self-contained subtraction worksheet where students solve the problems, match answers to clues, and cross off suspects until the mystery is cracked:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eChocolates for the Teacher\u003c\/strong\u003e — A box of chocolates has appeared on the teacher's desk from a secret admirer. Subtract your way down the clues to reveal who they are from, when, the ribbon colour, and the chocolate brand.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eValentine's Day Card\u003c\/strong\u003e — A card has been left on a friend's desk from a secret sender. Solve the problems to discover who sent it, when, and its envelope and pen colour.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLove Songs\u003c\/strong\u003e — A student keeps being heard singing love songs, but no one knows who. Work the subtraction to work out who, where, their vocal range, and song genre.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBunch of Flowers\u003c\/strong\u003e — A bunch of flowers has been left on the teacher's desk with no card. Subtract to reveal who they are from, when, the ribbon colour, and the type of flowers.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eActs of Kindness\u003c\/strong\u003e — Random acts of kindness have been spreading around the school and no one knows who is behind them. Solve each problem to uncover who, when, the kind act, and their reward.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhy Teachers Love It\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eZero prep\u003c\/strong\u003e — just print and hand out; every case is a single self-contained page.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSelf-checking\u003c\/strong\u003e — the suspect-elimination format means students catch their own errors and stay accountable.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eEngagement that lasts\u003c\/strong\u003e — the detective story pulls in even reluctant and struggling mathematicians.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDifferentiation-friendly\u003c\/strong\u003e — use one case at a time or the full set; ideal for mixed-ability classrooms.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eSkills Covered\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eSubtracting two-digit numbers with regrouping \/ borrowing\u003c\/li\u003e\n\u003cli\u003eColumn subtraction accuracy and place value\u003c\/li\u003e\n\u003cli\u003eFluency and mental-math confidence\u003c\/li\u003e\n\u003cli\u003eLogical reasoning and deductive process of elimination\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhat's Included\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e5 print-and-go mystery worksheets (one per case)\u003c\/li\u003e\n\u003cli\u003eFull answer keys for every case\u003c\/li\u003e\n\u003cli\u003eStudent detective instructions\u003c\/li\u003e\n\u003cli\u003eA themed Valentine's Day congratulations page\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eBest Used For\u003c\/h3\u003e\n\u003cp\u003eMath centers and rotations, independent practice, morning work, homework, early finishers, substitute\/relief days, indoor recess, spiral review, test prep, and Valentine's Day–themed math days — any time you want 2-digit subtraction practice that feels like a game.\u003c\/p\u003e","brand":"Kiwiland Education","offers":[{"title":"Default Title","offer_id":62008106320242,"sku":"5181585","price":4.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0909\/2848\/0626\/files\/2-digit-subtraction-with-regrouping-math-mystery-valentines-day-cover.jpg?v=1783290758"},{"product_id":"4-digit-addition-with-regrouping-math-mystery-worksheets-grades-3-5-valentines-day","title":"4-Digit Addition with Regrouping | Math Mystery Worksheets | Grades 3–5 | Valentine's Day","description":"\u003cp\u003e\u003cstrong\u003e4-digit addition with regrouping turns into a Valentine's Day detective hunt your students will beg to finish.\u003c\/strong\u003e In this no-prep, printable \u003cstrong\u003eMath Mystery\u003c\/strong\u003e, young investigators solve four-digit column addition problems, match each answer to a clue, and eliminate suspects one by one until only the culprit remains. The self-checking format keeps 3rd, 4th, and 5th graders locked in from the first sum to the last while they build real fluency adding four-digit numbers with regrouping (carrying). Five story-driven Valentine's cases make addition practice feel like a sweetheart whodunit — perfect for math centers, morning work, homework, early finishers, substitute days, indoor recess, spiral review, and Valentine's Day–themed math days.\u003c\/p\u003e\n\n\u003ch3\u003eQuick Details\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSkill:\u003c\/strong\u003e 4-digit addition with regrouping (carrying)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eGrades:\u003c\/strong\u003e 3–5 (3rd, 4th, 5th)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFormat:\u003c\/strong\u003e 5 no-prep printable mystery worksheets + full answer keys + a themed congratulations page (PDF)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTheme:\u003c\/strong\u003e Valentine's Day detective adventure\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eThe 5 Mysteries\u003c\/h3\u003e\n\u003cp\u003eEach case is a self-contained addition worksheet where students solve the sums, match answers to clues, and cross off suspects until the mystery is cracked:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eMystery Chocolates\u003c\/strong\u003e — A box of chocolates has appeared on the teacher's desk from a secret admirer. 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