Addition & Subtraction CSI Mystery Worksheets

Inside the case file

Looking for a fun and low-prep way to review addition and subtraction with regrouping? This AI-themed CSI Mystery Detective is the perfect back-to-school or summer review math activity for your 3rd grade, 4th grade, and 5th grade students. With a built-in detective storyline, students solve a series of puzzles to uncover who's behind the AI Classroom Takeover!

This printable mystery engages students in solving math problems and narrowing down suspects. As they complete each activity, they eliminate options from the list until only one person remains. It's a great way to reinforce fluency and critical thinking in a meaningful context.

What's Included:

• Adding multiple 2-digit numbers
• 3-digit addition with regrouping
• Subtraction from 1000
• 3-digit subtraction with regrouping
• Answer sheets included
• Print-and-go format (color and black-and-white)

CSI Mystery Detective packs are independent escape room or crack-the-code types of fun math activities where instead of using locks, students identify suspects using puzzles and word problems. They're perfect for back-to-school, summer school, or end-of-year math review.

This mystery is designed for 3rd and 4th grade students, but can also be used with struggling 5th graders who need extra practice or gifted 2nd grade students looking for a challenge. These make excellent sub plans or review tasks for early finishers—and are also a hit with homeschool families!

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