{"product_id":"multiplication-division-csi-mystery-worksheets-grades-3-5-alien-invasion","title":"Multiplication \u0026 Division CSI Mystery Worksheets | Grades 3–5 | Alien Invasion","description":"\u003cp\u003e3rd grade and 4th grade math review drives these Alien Invasion CSI math worksheets: multiplication facts, rounding to the nearest ten and multi-digit addition in one CSI Mystery Detective case. It slots into January as winter math activities to get the class back into gear. The invaders read our digital numbers faster than we do, so the last defense is math worked by hand until it names the alien in charge. Both color and black-and-white versions are included, and the only prep is the printer. Students check answers, crack a code chart and trace the right path, ruling out a suspect per correct answer until the mystery ends on one alien, answer keys included.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eThe Case: Alien Invasion\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cp\u003eIt was only ever a matter of time before they arrived, and our own technology made it easy for them. Every digital system we built runs on numbers, and the invaders learned to read them faster than we did. Now the only defence left is the one thing they did not expect anyone to still do by hand: work the math out properly, on paper, and use it to find the one alien behind the whole operation.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eWhat's Inside\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cul\u003e\n  \u003cli\u003eChecking answers for errors and tallying the results to settle a clue\u003c\/li\u003e\n  \u003cli\u003eMulti-step problems where the last answer unlocks a code chart\u003c\/li\u003e\n  \u003cli\u003eAddition with three-digit and four-digit numbers\u003c\/li\u003e\n  \u003cli\u003eRounding to the nearest ten, shading the correct answer to reveal letters\u003c\/li\u003e\n  \u003cli\u003eMultiplication facts used to trace the right path to the final clue\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\u003eYour students get a crime, a line-up and a page of math worksheets - nothing else. The answers do the eliminating: one correct answer, one suspect gone, until only the culprit is left. That is a CSI Mystery Detective case, and it works like a math escape room without the locks or the login. It also marks itself, which a practice page never does, because a wrong answer leaves a description matching nobody. Run it as a whole math activity, 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\u003eSpiral math review across multiplication, addition and rounding in one sitting\u003c\/li\u003e\n  \u003cli\u003eBack-to-school weeks, to see what came back with them\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 3rd grade and 4th grade. Third graders will find the four-digit addition a stretch and often pair up for it; fourth graders can usually run the whole case on their own. It also gives 5th grade students who need multiplication and rounding review something worth doing.\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\u003eSeveral math skills reviewed in one activity rather than one skill drilled\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":61951204786546,"sku":"3789957","price":4.5,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0909\/2848\/0626\/files\/alien-invasion-mystery-detective-multiplication-division-grades-3-4-3789957.jpg?v=1792459713","url":"https:\/\/kiwilandeducation.com\/products\/multiplication-division-csi-mystery-worksheets-grades-3-5-alien-invasion","provider":"Kiwiland Education","version":"1.0","type":"link"}