{"product_id":"skip-counting-addition-csi-math-mystery-worksheets-grades-3-6-the-hundreds-chart-heist","title":"Skip Counting \u0026 Addition CSI Math Mystery Worksheets | Grades 3–6 | The Hundreds Chart Heist","description":"\u003cp\u003eTurn skip counting and addition review into a detective investigation your students won't want to put down. A two-digit number has pulled off a heist on the hundreds chart, and your class is on the case. This printable \u003cstrong\u003eSkip Counting \u0026amp; Addition CSI Math Mystery\u003c\/strong\u003e is designed for \u003cstrong\u003eGrades 3–6 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\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 skip counting and addition and subtraction within 100. No apps, no prep, no fuss.\u003c\/p\u003e\n\u003ch3\u003eQuick Details\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eGrade Levels:\u003c\/strong\u003e Grades 3–6 (best for 3rd–5th; works as a 6th-grade warm-up or review)\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 Skip counting by 3s and 4s, addition \u0026amp; subtraction within 100, identifying 2-digit numbers, comparing and sorting numbers\u003cbr\u003e\n\u003cstrong\u003ePages:\u003c\/strong\u003e 9+ 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\u003ch3\u003eCase Summary\u003c\/h3\u003e\n\u003cp\u003eSomething has gone missing from the hundreds chart, and the only suspect is a two-digit number that knows how to cover its tracks. Your students grab their pencils, pull on their detective coats, and step up to the scene — the only way to name the culprit is to follow the math.\u003c\/p\u003e\n\u003cp\u003eThe first break in the case is a coded message. Students decode it to reveal their lead, then track the suspect through the patterns it left behind: skip counting by threes and fours across the hundreds chart, circling the numbers that fit and crossing off the ones that don't. With each pattern, the lineup of suspects gets shorter.\u003c\/p\u003e\n\u003cp\u003eThen the witnesses take the stand. A full page of addition and subtraction problems within 100 narrows the field down to the final two — but neither suspect is talking. In the last interrogation, a hundreds-chart puzzle forces the truth out and reveals exactly which number pulled off the heist.\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\u003eSkip counting by 3s and 4s on a hundreds chart\u003c\/li\u003e\n  \u003cli\u003eAdding and subtracting within 100\u003c\/li\u003e\n  \u003cli\u003eIdentifying 2-digit numbers\u003c\/li\u003e\n  \u003cli\u003eComparing and sorting numbers\u003c\/li\u003e\n  \u003cli\u003eCompleting a hundreds chart\u003c\/li\u003e\n  \u003cli\u003eCode breaking with addition\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\u003eSkip counting and addition clue pages\u003c\/li\u003e\n  \u003cli\u003eHundreds-chart 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\u003eBack-to-school and end-of-year math review (and all-year use)\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\u003eEnd-of-unit review\u003c\/li\u003e\n  \u003cli\u003eSkip counting and addition practice and reinforcement\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Kiwiland Education","offers":[{"title":"Default Title","offer_id":61980785770866,"sku":"2672015","price":4.5,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0909\/2848\/0626\/files\/skip-counting-addition-csi-math-mystery-grades-3-6-cover.jpg?v=1782475606","url":"https:\/\/kiwilandeducation.com\/products\/skip-counting-addition-csi-math-mystery-worksheets-grades-3-6-the-hundreds-chart-heist","provider":"Kiwiland Education","version":"1.0","type":"link"}