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

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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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Kiwiland Education

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

$4.50 USD

Make summer school addition and subtraction review feel like a case worth cracking. This printable Summer School Addition & Subtraction CSI Math Mystery is designed for Grades 3–6 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 problem solving. No apps, no prep, no fuss.

Quick Details

Grade Levels: Grades 3–6 (best for Grades 3–5)
Format: Printable PDF
Resource Type: CSI Math Mystery worksheets
Math Skills: Adding multiple 2-digit numbers, 3-digit addition with regrouping, and subtraction from 1000
Pages: 26 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

It is the first day of summer school, the students are in their seats — but the teacher is nowhere to be found. The lesson plans are on the desk, the coffee is still warm, yet the teacher has vanished without a trace. Your students will have to crack the case themselves.

As CSI Math Investigators, students solve a series of addition and subtraction clues to gather evidence and rule each suspect out.

With every solved clue, the suspect list shrinks until only the culprit behind the disappearance remains.

Can your investigators crack the clues and find the missing summer school teacher? Sharpen those pencils and solve the case.

Skills Covered

Students will practice:

  • Adding multiple 2-digit numbers
  • 3-digit addition with regrouping
  • Subtraction from 1000
  • 3-digit subtraction with regrouping
  • Using answers to eliminate suspects
  • Logic, reasoning, and problem solving

What's Included

  • CSI-style addition and subtraction mystery activity
  • Summer mystery story and suspect list
  • Math clue worksheets and puzzles
  • Answer key
  • Color and black-and-white versions
  • Print-and-go PDF format

Best Used For

This printable CSI Math Mystery works well for:

  • Summer school and end-of-year review
  • Addition and subtraction regrouping practice
  • Math centers and early finishers
  • Substitute teacher plans
  • Small groups, RTI, and intervention
  • Homeschool math

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

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  • 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.

Summer School CSI math mystery for 3rd–5th grade addition and subtraction

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

$4.50

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