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"Great resource, low prep, easy to use, and fun! Thank you for sharing this! Highly recomend to other teachers!"

Brandie K.

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"My students loved this resource! They were engaged and were able to complete the tasks with ease."

Gina H.

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"I have enjoyed every purchase I've made from your store. The students are always so engaged!"

Karen C.

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Kiwiland Education

Addition & Subtraction CSI Math Mystery – Printable Workheets | AI Classroom Takeover

$4.50 USD

Need a no-prep way to review addition and subtraction with regrouping? This CSI Math Mystery, AI Classroom Takeover, helps 3rd, 4th, and 5th grade students practice math fluency while solving puzzles to eliminate suspects and crack the case.

This engaging printable activity is perfect for back-to-school math, summer review, or even end-of-year wrap-ups. It’s also great for homeschool learners looking for a fun, detective-themed math challenge.

As students work through the clues, they’ll reinforce skills like multi-digit addition, subtracting from 1000, and 3-digit regrouping—all while staying focused and motivated.

What’s Included:

  • Adding multiple 2-digit numbers

  • 3-digit addition with regrouping

  • Subtraction from 1000

  • 3-digit subtraction with regrouping

  • Answer key

  • Print-and-go format (color + black and white)

Math Mysteries are independent escape room or crack-the-code types of fun math activities where students identify suspects using puzzles and word problems instead of locks. Students love the story-driven format, and teachers love the targeted skill review with built-in engagement.

Thank you

Kiwiland Education

All of our products are digital downloads — no physical items will be shipped.

  • After purchase, you’ll receive an email with a download link within minutes.
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Due to the nature of digital products, all sales are final.

We do not offer refunds or exchanges once a file has been downloaded.

However, if you encounter any problems with your download or the product itself, please reach out — we're happy to assist.

"Great resource, low prep, easy to use, and fun! Thank you for sharing this! Highly recomend to other teachers!"

Brandie K.

Verified buyer

"My students loved this resource! They were engaged and were able to complete the tasks with ease."

Gina H.

Verified buyer

"I have enjoyed every purchase I've made from your store. The students are always so engaged!"

Karen C.

Verified buyer

  • Thank you from Kiwiland Education

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3rd and 4th grade addition and subtraction CSI math mystery with regrouping

Addition & Subtraction CSI Math Mystery – Printable Workheets | AI Classroom Takeover

$4.50

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