Addition & Subtraction CSI Mystery Worksheets | Grades 2–3 | Jungle Juice Fever

CSI Mystery Detective case on addition and subtraction within 100 and missing numbers to 100, delivered as CSI math worksheets about a jungle camp that something raided in the dark this October. Built for 2nd grade and 3rd grade, it turns a plain addition and subtraction mystery into a hunt for whatever dug to the bottom of the backpack, because the culprit left just enough behind to be identified. Every page prints in color or black and white, and answer keys are included. Students complete number sequences to reveal the next part of the description, work linked questions down to one final number and use subtraction clues, shortening the line-up with every right answer.

The Case: Jungle Juice Fever

Your students wake up in the jungle after a long night, starving. They climb out of the sleeping bag, reach for the backpack and dig right down to the bottom, because the good stuff was buried where nothing could get at it. It is not there. Something came through the camp in the dark, and it left just enough behind to be identified.

What's Inside

• Number sequences completed to reveal the next part of the description
• Addition and subtraction within 100 across the clue pages
• A sequence of linked questions that builds to one final number
• Subtraction problems used to settle a clue about the culprit
• A suspect line-up that narrows every time a clue is solved
• Full color and black-and-white versions of every page
• Answer keys for the whole case

What Is a CSI Mystery Detective Case?

A CSI Mystery Detective case turns a page of math into evidence. Students solve, each correct answer strikes one name off the suspect list, and the case closes on the last one standing. There is nothing to unlock, download or prepare - it is a math escape room made of paper. Detective activities police themselves in a way ordinary math worksheets cannot: an error leaves a culprit nobody can arrest, so the class goes back over it. A math activity that carries a lesson, a center rotation, or a sub plan.

When to Use This Resource

• Addition and subtraction review before or after a unit test
• Back-to-school weeks and end of year review
• Math centers, early finishers and independent work
• Emergency sub plans that run themselves
• A jungle, rainforest or animals topic week, alongside reading or science work

Grade Levels

Built for 2nd grade and 3rd grade. Second graders usually run it comfortably with a little support on the sequence page; third graders finish inside a lesson. It also suits 4th grade students who need addition and subtraction review in a form that does not look like going back a year.

Why Teachers Love CSI Mystery Detective Cases

• Zero prep - print and hand out
• Self-checking by design, because a wrong answer breaks the deduction
• Practice students ask to do again
• Works as a whole lesson, a center, or a filler for an awkward afternoon

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