Skip to content

Welcome guest

Please login or register
Skip to product information

"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

Kiwiland Education

Summer School Addition & Subtraction CSI Mystery Worksheets | Grades 3–6 | The Missing Teacher

$4.50 USD

Looking for a fun summer school math activity to review addition and subtraction with regrouping? This printable CSI Mystery Detective is a no-prep set of CSI math worksheets, perfect for 3rd grade and 4th grade students and also useful for struggling 5th graders who need reinforcement with adding and subtracting. It's a great fit for end of year math, summer review, or low-prep math centers.

In this engaging detective-style game, students solve a series of puzzles and eliminate suspects as they work through the challenges. They'll be eager to uncover the culprit while reviewing key computation skills in a meaningful, fun way.

This no-prep case is perfect for classroom use, summer school, homework, early finishers, and homeschool enrichment.

What's Included:

  • Adding multiple 2-digit numbers
  • 3-digit addition with regrouping
  • Subtraction from 1000
  • 3-digit subtraction with regrouping
  • Printable in color and black-and-white
  • Answer key included

CSI Mystery Detective packs are independent escape room or crack-the-code types of fun activities where students identify suspects using puzzles and word problems instead of locks. This summer-themed case makes review exciting while building accuracy and confidence.

Love this resource?

Follow Kiwiland Education to discover more addition and subtraction worksheets, summer math activities, and CSI-style printable cases for your classroom.

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.

New to the format? Read What Is a Math Mystery? for how they work and how to run one in class.

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.

More like this

From End of Year and Summer Activities

See all End of Year and Summer Activities

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.

Summer school addition subtraction mystery detective grades 3-5

Summer School Addition & Subtraction CSI Mystery Worksheets | Grades 3–6 | The Missing Teacher

$4.50

Your Cart

THANK YOU FOR SHOPPING

Your Cart is empty
Let's fix that

You might like...

Search our store

Your Wishlist