$Skip counting and addition CSI Math Mystery cover for grades 3 to 6, The Number on the Loose case$ $Skip counting and addition CSI Math Mystery cover for grades 3 to 6, The Number on the Loose case$
$CSI Math Mystery clue pages with skip counting and a hundreds chart puzzle$ $CSI Math Mystery clue pages with skip counting and a hundreds chart puzzle$
$Printable math detective worksheets with suspect elimination for grades 3 to 5$ $Printable math detective worksheets with suspect elimination for grades 3 to 5$
$No-prep skip counting and addition math mystery with answer key included$ $No-prep skip counting and addition math mystery with answer key included$

$Skip counting and addition CSI Math Mystery cover for grades 3 to 6, The Number on the Loose case$
$CSI Math Mystery clue pages with skip counting and a hundreds chart puzzle$
$Printable math detective worksheets with suspect elimination for grades 3 to 5$
$No-prep skip counting and addition math mystery with answer key included$

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

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Verified buyer

"My students loved this resource! They were engaged and were able to complete the tasks with ease."

Gina H.

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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 & Skip Counting CSI Math Mystery Worksheets | Grades 3–6 | The Number on the Loose

Name: Addition & Skip Counting CSI Math Mystery Worksheets | Grades 3–6 | The Number on the Loose
Brand: Kiwiland Education
SKU: 2671758
Price: 4.5 USD
Availability: InStock

$4.50 USD

Make skip counting and addition review feel like a case worth cracking. A two-digit number is loose somewhere on the hundreds chart, and your students are the detectives assigned to bring it in. This printable Skip Counting & Addition CSI Math Mystery is built 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 4s and 5s, addition & subtraction within 100, 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

A number has gone on the run, and it left its fingerprints all over the hundreds chart. Your students pull on their detective coats, sharpen their pencils, and report to the crime scene — the only way to catch the culprit is to follow the math.

The trail starts with a coded message. Students crack the cipher to reveal their first lead, then chase the suspect through the patterns it left behind: skip counting by fives, tracing a skip-counting-by-fours path across the hundreds chart, and matching each clue against the lineup of suspects. With every pattern they uncover, more numbers are cleared and the net tightens.

Next come the witnesses. A full page of addition and subtraction problems within 100 narrows the field to the final stretch — but two suspects still won't confess. In the last interrogation, a hundreds-chart puzzle forces the truth into the open and names the number that did it.

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

Skills Covered

Students will practice:

Skip counting by 5s
Skip counting by 4s on a hundreds chart
Adding and subtracting within 100
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

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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.

$Skip counting and addition CSI Math Mystery cover for grades 3 to 6, The Number on the Loose case$