{"product_id":"halloween-addition-subtraction-within-100-csi-math-mystery-grades-1-3-the-haunted-house","title":"Halloween Addition \u0026 Subtraction Within 100 CSI Math Mystery | Grades 1–3 | The Haunted House","description":"\u003cp\u003e\u003cstrong\u003eSomething is haunting the old house, and only your students' addition and subtraction skills can reveal who.\u003c\/strong\u003e In this Halloween \u003cstrong\u003eThe Haunted House CSI Math Mystery\u003c\/strong\u003e, students work like detectives, solving problems and puzzles to eliminate suspects one by one until the villain is unmasked. It's an engaging, \u003cstrong\u003eno-prep, print-and-go\u003c\/strong\u003e Halloween math activity that keeps the whole class hooked.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhat's inside:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eSubtraction within 20 using mental strategies\u003c\/li\u003e\n\u003cli\u003eAdding a 1-digit number to a 2-digit number with regrouping\u003c\/li\u003e\n\u003cli\u003e2-digit addition with no regrouping\u003c\/li\u003e\n\u003cli\u003eGreater than \/ less than worksheet and activity\u003c\/li\u003e\n\u003cli\u003eAddition within 100 using mental strategies\u003c\/li\u003e\n\u003cli\u003eComplete answer keys included\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eWhat is a CSI Math Mystery?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eA CSI Math Mystery is an interactive, independent activity that feels like a classroom escape room — without the locks or complicated prep. Instead of codes, students solve math problems to uncover clues, cross off suspects, and finally crack the case. Each one blends real math practice with critical thinking, so students stay motivated from the first clue to the reveal.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhen to use this resource:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eHalloween and October math activities\u003c\/li\u003e\n\u003cli\u003eAddition and subtraction review within 100\u003c\/li\u003e\n\u003cli\u003eEarly finisher and independent work\u003c\/li\u003e\n\u003cli\u003eMath centers and small groups\u003c\/li\u003e\n\u003cli\u003eSubstitute teacher and low-prep days\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eGrade levels:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eDesigned for Grades 1–3, and ideal for reviewing addition and subtraction within 100. Great for struggling older students who need reinforcement, or advanced younger students ready for a challenge.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eLove this resource?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eFollow \u003cstrong\u003eKiwiland Education\u003c\/strong\u003e to discover more CSI Math Mysteries and be the first to hear about new releases, discounts, and fresh printables for your classroom.\u003c\/p\u003e","brand":"Kiwiland Education","offers":[{"title":"Default Title","offer_id":61951807521138,"sku":"3769838","price":4.5,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0909\/2848\/0626\/files\/halloween-addition-subtraction-within-100-csi-math-mystery-grades-1-3.jpg?v=1781761989","url":"https:\/\/kiwilandeducation.com\/products\/halloween-addition-subtraction-within-100-csi-math-mystery-grades-1-3-the-haunted-house","provider":"Kiwiland Education","version":"1.0","type":"link"}