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"Great resource, low prep, easy to use, and fun! Thank you for sharing this! Highly recommend 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."

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

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Kiwiland Education

Addition & Subtraction CSI Math Mystery Worksheets | Grades 3–5 | AI Classroom Takeover

$4.50 USD

Turn addition and subtraction review into a detective investigation your students won't want to put down. This printable Addition & Subtraction CSI Math Mystery is designed for 3rd, 4th, and 5th grade classroom teachers, homeschool parents, and tutors who want focused math practice wrapped in a story students actually care about solving.

Students work through a series of clue pages, use their answers to eliminate suspects, and race to crack the case — all while getting meaningful practice with addition, subtraction, and regrouping. No apps, no prep, no fuss.

Quick Details

Grade Levels: 3rd, 4th, and 5th grade
Format: Printable PDF
Resource Type: CSI Math Mystery worksheets
Math Skills: Addition, subtraction, regrouping, and problem solving
Pages: 16 pages including answer key
Best For: Math centers, sub plans, early finishers, review, small groups, and homeschool math
Tech Needed: None — no apps, locks, passwords, or student logins required

Case Summary

You wake up excited for another day of learning — but the moment you walk into the classroom, something feels very wrong. The lights are flickering. The computers are flashing cryptic messages. Your teacher pulls you aside and explains in a hushed voice that a rogue AI has taken over the school's entire digital system.

The AI has locked down every computer and is sending out strange puzzles and riddles, toying with students and teachers alike. But there is a way out: if your class can solve the AI's challenges, piece together the clues, and uncover the villain's name, you can take back control and save the school day.

It is time to become digital detectives. Work together, follow the evidence, and use your math skills to outsmart the rogue program before the clock runs out. The fate of your classroom is in your hands.

Skills Covered

Students will practice:

  • Adding multiple 2-digit numbers
  • 3-digit addition with regrouping
  • Subtraction from 1,000
  • 3-digit subtraction with regrouping
  • Number sense and careful calculation
  • Using answers to eliminate suspects
  • Logic, reasoning, and problem solving

What's Included

  • CSI-style math mystery activity
  • Addition and subtraction clue pages
  • Suspect elimination activity
  • Answer key
  • Color and black-and-white versions
  • Print-and-go PDF format

Best Used For

This printable CSI Math Mystery works well for:

  • Back-to-school and end-of-year review
  • Math centers and early finishers
  • Substitute teacher plans
  • Small groups and independent work
  • Homeschool math
  • End-of-unit review
  • Addition and subtraction practice and reinforcement

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.
  • Make sure to check your spam or promotions folder if you don't see it right away.
  • If you experience any issues accessing your files, please contact us and we’ll help you promptly.

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.

  • Thank you from Kiwiland Education

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

How CSI Math Mysteries Work

CSI Math Mysteries turn regular math practice into a clue-based investigation. Students solve problems, use their answers as evidence, and eliminate suspects until the case is solved.

1

Read the Case

Students begin with a short mystery scenario and find out what needs to be solved.

2

Solve the Clues

Each clue gives students focused math practice using the target skill for that resource.

3

Eliminate Suspects

Students use their answers to remove suspects from the investigation one clue at a time.

4

Crack the Case

By the end, only one suspect remains and students can reveal the answer to the mystery.

No apps, locks, passwords, or student logins are required. Just print and go.

Why Teachers Use CSI Math Mysteries

CSI Math Mysteries turn skill practice into a clue-based investigation students want to solve. They are easy to prep, flexible for different classroom routines, and help students practice math skills while using logic, reasoning, and careful problem solving.

Teacher-Friendly Review

Practice that feels like a mystery, not another worksheet.

CSI Math Mysteries help students stay focused by turning skill practice into a clue-based case. They are easy to prep, simple to use, and flexible enough for busy classroom routines.

No-Prep and Print-and-Go

Use the pages right away for review, math centers, sub plans, small groups, early finishers, or homeschool math.

Encourages Careful Thinking

Students need accurate answers to eliminate suspects, which encourages checking, reasoning, and attention to detail.

Easy to Fit Into Lessons

Use a full mystery in one session or split the clues across centers, partner work, intervention, or review rotations.

Builds Student Confidence

The mystery format gives students a clear purpose for practicing math skills and helps make review feel more rewarding.

CSI Math Mysteries combine focused math practice with problem solving, logic, and a detective-style task that students can complete independently or with support.

Frequently Asked Questions For CSI Math Mysteries

Printable CSI Math Mystery worksheets that turn math practice into clue-based detective investigations.

Is this CSI Math Mystery a digital activity?

No. This is a printable PDF resource. Students complete the CSI Math Mystery on paper. No physical item will be shipped.

Do students need apps, locks, passwords, or logins?

No. Students do not need apps, locks, passwords, or logins. Teachers can print the pages and use the CSI Math Mystery straight away.

How do students solve the CSI Math Mystery?

Students solve math clues and use their answers to eliminate suspects. Each correct answer helps them narrow down the case until only one suspect remains.

Can this CSI Math Mystery be used for sub plans?

Yes. CSI Math Mysteries work well for sub plans because students can work through the clues independently, with a partner, or in small groups.

Can this CSI Math Mystery be used for homeschool?

Yes. This printable CSI Math Mystery can be used for homeschool lessons, tutoring, review practice, enrichment, or extra math support.

Will this work for early finishers or math centers?

Yes. CSI Math Mysteries are a good fit for early finishers, math centers, small groups, independent work, review lessons, and extra practice activities.

Recommended Products

Keep students practicing key math skills with more clue-based printable CSI Math Mystery worksheets.

Addition and subtraction CSI math mystery worksheets for 3rd, 4th, and 5th grade — AI Classroom Takeover cover

Addition & Subtraction CSI Math Mystery Worksheets | Grades 3–5 | AI Classroom Takeover

$4.50

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