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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

Perimeter & Area CSI Math Mystery Worksheets | Grades 3–5 | Geometry Wars

$4.50 USD

Make perimeter and area practice feel like a case worth cracking. This printable Perimeter & Area CSI Math Mystery is designed for Grades 3–5 classroom teachers, homeschool parents, and tutors who want focused geometry 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 perimeter, area, and problem solving. No apps, no prep, no fuss.

Quick Details

Grade Levels: Grades 3–5
Format: Printable PDF (includes US Customary and Metric versions)
Resource Type: CSI Math Mystery worksheets
Math Skills: Perimeter of shapes, finding missing side lengths, area of quadrilaterals, and area maze puzzles
Pages: 15+ 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 started with one careless mistake. A student called a shape by the wrong name, an argument broke out, and the disagreement spread — from the classroom to the playground and out into the streets — until the whole town was swept up in an all-out Geometry War.

Now, in the middle of the chaos, a shape has gone missing. Someone took it... but who? And why? That's where your students come in.

As CSI Math Investigators, students measure perimeters, calculate areas, and work each clue to gather evidence and rule suspects out — one at a time — until only the culprit remains.

Can your detectives crack the clues and expose the shape-napper before the Geometry War spirals out of control? Sharpen those pencils and open the case.

Skills Covered

Students will practice:

  • Calculating the perimeter of shapes
  • Finding missing side lengths using perimeter
  • Calculating the area of quadrilaterals
  • Solving area maze puzzles
  • Working in both US Customary and metric units
  • Using answers to eliminate suspects
  • Logic, reasoning, and problem solving

What's Included

  • CSI-style perimeter and area mystery activity
  • Perimeter and area clue pages
  • Suspect elimination activity
  • Answer key
  • US Customary and Metric versions
  • Print-and-go PDF format

Best Used For

This printable CSI Math Mystery works well for:

  • Geometry review before testing
  • Math centers and early finishers
  • Substitute teacher plans
  • Small groups and independent work
  • Homeschool math
  • End-of-unit review
  • Perimeter and area practice and reinforcement

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.

Perimeter and Area CSI Math Mystery cover - geometry detective activity for grades 3-5

Perimeter & Area CSI Math Mystery Worksheets | Grades 3–5 | Geometry Wars

$4.50

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