{"product_id":"addition-subtraction-csi-mystery-worksheets-grades-2-5-the-valentines-surprise-card","title":"Addition \u0026 Subtraction CSI Mystery Worksheets | Grades 2–5 | The Valentine's Surprise Card","description":"\u003cp\u003eValentines Day CSI math worksheets for February, built around addition and subtraction with two-digit, three-digit and four-digit numbers and wrapped in a CSI Mystery Detective case. Someone left an unsigned envelope in a desk before the bell, and 2nd grade and 3rd grade students find out who by getting the math right. It is a fun subtraction and addition activity that doubles as solid practice, and the mystery keeps them working long after a plain page would have lost them. Zero setup - print and hand it over. Correct answers get colored, a cryptogram gets cracked, and a chain of linked clues narrows the line-up one suspect at a time. Answer keys included.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eThe Case: The Surprise Card\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cp\u003eValentines Day is finally here and you have worn your best clothes to school for it. The bell goes, you open your desk for your math book, and there is an envelope sitting on top of it that you did not put there. No name on it. Somebody in this room got up early, and your students are going to work out which one.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eWhat's Inside\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cul\u003e\n  \u003cli\u003eDeciding which number problems are correct and coloring the right answers\u003c\/li\u003e\n  \u003cli\u003eA cryptogram that reveals the color of a strand of hair left in the envelope\u003c\/li\u003e\n  \u003cli\u003eMulti-step problems where the last answers give a shoe size\u003c\/li\u003e\n  \u003cli\u003eChecking worked answers for errors and tallying which are correct\u003c\/li\u003e\n  \u003cli\u003eA sequence of linked clues that builds to one final number\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\u003eA CSI Mystery Detective case is a printable math activity dressed as police work. Your class gets a crime, a line-up of suspects and a page of math worksheets, and the answers do the eliminating until one name is left. It is a math escape room without the locks, the app or the prep. Unlike a practice page it will not let a wrong answer pass quietly - the case stops closing - so students check as they go. Use it for a lesson, in math centers, or as detective activities for early finishers.\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\u003eValentines Day in February, when a normal worksheet will not hold them\u003c\/li\u003e\n  \u003cli\u003eAddition and subtraction 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 usually pair up on the larger numbers; third graders run the case independently. It also suits 4th grade students who need addition and subtraction review in a form that does not look like going back a year.\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 Valentines 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":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-surprise-card-mystery-detective-add-subtract-grades-2-4-3607787.jpg?v=1792459172","url":"https:\/\/kiwilandeducation.com\/products\/addition-subtraction-csi-mystery-worksheets-grades-2-5-the-valentines-surprise-card","provider":"Kiwiland Education","version":"1.0","type":"link"}