$Skip counting and addition CSI Math Mystery cover for grades 3 to 6, The Hundreds Chart Heist case$ $Skip counting and addition CSI Math Mystery cover for grades 3 to 6, The Hundreds Chart Heist case$
$CSI Math Mystery clue pages with skip counting by 3s and 4s on a hundreds chart$ $CSI Math Mystery clue pages with skip counting by 3s and 4s on a hundreds chart$
$Printable math detective worksheets with suspect elimination for upper elementary$ $Printable math detective worksheets with suspect elimination for upper elementary$
$No-prep skip counting and addition math mystery with answer key included$ $No-prep skip counting and addition math mystery with answer key included$

$Skip counting and addition CSI Math Mystery cover for grades 3 to 6, The Hundreds Chart Heist case$
$CSI Math Mystery clue pages with skip counting by 3s and 4s on a hundreds chart$
$Printable math detective worksheets with suspect elimination for upper elementary$
$No-prep skip counting and addition math mystery with answer key included$

"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

Skip Counting & Addition CSI Math Mystery Worksheets | Grades 3–6 | The Hundreds Chart Heist

Name: Skip Counting & Addition CSI Math Mystery Worksheets | Grades 3–6 | The Hundreds Chart Heist
Brand: Kiwiland Education
SKU: 2672015
Price: 4.5 USD
Availability: InStock

$4.50 USD

Turn skip counting and addition review into a detective investigation your students won't want to put down. A two-digit number has pulled off a heist on the hundreds chart, and your class is on the case. This printable Skip Counting & Addition 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 skip counting and addition and subtraction within 100. No apps, no prep, no fuss.

Quick Details

Grade Levels: Grades 3–6 (best for 3rd–5th; works as a 6th-grade warm-up or review)
Format: Printable PDF
Resource Type: CSI Math Mystery worksheets
Math Skills: Skip counting by 3s and 4s, addition & subtraction within 100, identifying 2-digit numbers, comparing and sorting numbers
Pages: 9+ 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

Something has gone missing from the hundreds chart, and the only suspect is a two-digit number that knows how to cover its tracks. Your students grab their pencils, pull on their detective coats, and step up to the scene — the only way to name the culprit is to follow the math.

The first break in the case is a coded message. Students decode it to reveal their lead, then track the suspect through the patterns it left behind: skip counting by threes and fours across the hundreds chart, circling the numbers that fit and crossing off the ones that don't. With each pattern, the lineup of suspects gets shorter.

Then the witnesses take the stand. A full page of addition and subtraction problems within 100 narrows the field down to the final two — but neither suspect is talking. In the last interrogation, a hundreds-chart puzzle forces the truth out and reveals exactly which number pulled off the heist.

Hand your students the evidence, point them at the suspects, and let them prove they can crack the case. The math is the only thing standing between them and the truth.

Skills Covered

Students will practice:

Skip counting by 3s and 4s on a hundreds chart
Adding and subtracting within 100
Identifying 2-digit numbers
Comparing and sorting numbers
Completing a hundreds chart
Code breaking with addition
Using answers to eliminate suspects
Logic, reasoning, and problem solving

What's Included

CSI-style math mystery activity
Skip counting and addition clue pages
Hundreds-chart puzzles
Suspect elimination activity
Answer key
Print-and-go PDF format

Best Used For

This printable CSI Math Mystery works well for:

Back-to-school and end-of-year math review (and all-year use)
Math centers and early finishers
Substitute teacher plans
Small groups and independent work
Homeschool math
End-of-unit review
Skip counting and addition 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.

$Skip counting and addition CSI Math Mystery cover for grades 3 to 6, The Hundreds Chart Heist case$