{"product_id":"halloween-addition-subtraction-within-100-csi-mystery-grades-1-3-the-haunted-house","title":"Halloween Addition \u0026 Subtraction Within 100 CSI Mystery Worksheets | Grades 1–3 | The Haunted House","description":"\u003cp\u003eOctober Halloween CSI math worksheets on addition and subtraction within 100, built as a CSI Mystery Detective case about the house on the corner that everybody has a story about. Pitched at 2nd grade and 3rd grade, it gives the class a subtraction mystery with an actual monster at the end, and it prints in color or black and white with nothing to prepare. This week somebody actually went inside and came back out with a description that matches nothing anyone has heard before. Answer keys are included. Students check worked answers for errors, color the correct arrow and follow linked clues to the monster's final age, crossing off a suspect with each correct answer.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eThe Case: Who Haunts The House?\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cp\u003eYou do not really believe the stories your friends tell about demons and hauntings, but they are good stories, and the best of them is always about the house on the corner. Everyone knows the one. This week somebody actually went in, and came back out again with a description that does not match anything anybody has heard before.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eWhat's Inside\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cul\u003e\n  \u003cli\u003eChecking worked answers for errors and tallying which are correct\u003c\/li\u003e\n  \u003cli\u003eAddition within 100 across the clue pages\u003c\/li\u003e\n  \u003cli\u003eAddition problems used to color the correct arrow to the next problem\u003c\/li\u003e\n  \u003cli\u003eTwo-digit subtraction used to settle a clue about the monster\u003c\/li\u003e\n  \u003cli\u003eA sequence of linked clues that builds to the monster's final age\u003c\/li\u003e\n  \u003cli\u003eFull color and black-and-white versions of every page\u003c\/li\u003e\n  \u003cli\u003eAnswer keys for the whole case\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003e\u003cstrong\u003eWhat Is a CSI Mystery Detective Case?\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cp\u003eThe premise of a CSI Mystery Detective case is that the math breaks the alibis. Students solve, each correct answer removes one suspect from the line-up, and the last name standing is the one who did it. It is a math escape room with no locks, no app and nothing to set up. Detective activities are harder to coast through than ordinary math worksheets, because the deduction only closes on correct work. It fills a whole math activity, suits math centers, and works as a sub plan.\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\u003eHalloween week in October, when a normal worksheet will not hold them\u003c\/li\u003e\n  \u003cli\u003eAddition and subtraction within 100 review before or after a unit test\u003c\/li\u003e\n  \u003cli\u003eMath centers, early finishers and independent work\u003c\/li\u003e\n  \u003cli\u003eEmergency sub plans that run themselves\u003c\/li\u003e\n  \u003cli\u003eEnd of year review, when attention is thin and the work still has to happen\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003e\u003cstrong\u003eGrade Levels\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cp\u003eBuilt for 2nd grade and 3rd grade. Second graders run it comfortably, which makes it a good one for a class that needs a win; third graders finish inside a lesson. It also suits 1st grade students who are ahead and ready for two-digit work with something at stake.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eWhy Teachers Love CSI Mystery Detective Cases\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cul\u003e\n  \u003cli\u003eZero prep - print and hand out\u003c\/li\u003e\n  \u003cli\u003eSelf-checking by design, because a wrong answer breaks the deduction\u003c\/li\u003e\n  \u003cli\u003eA Halloween activity that still does real math\u003c\/li\u003e\n  \u003cli\u003eWorks as a whole lesson, a center, or a filler for an awkward afternoon\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eLove this resource?\u003c\/p\u003e\n\n\u003cp\u003eFollow Kiwiland Education for new detective cases, seasonal math activities and updates on discounts and new releases.\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":61951807521138,"sku":"3769838","price":4.5,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0909\/2848\/0626\/files\/haunted-house-halloween-mystery-detective-add-subtract-within-100-3769838.jpg?v=1792459696","url":"https:\/\/kiwilandeducation.com\/products\/halloween-addition-subtraction-within-100-csi-mystery-grades-1-3-the-haunted-house","provider":"Kiwiland Education","version":"1.0","type":"link"}