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

Brandie K.

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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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"I have enjoyed every purchase I've made from your store. The students are always so engaged!"

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Kiwiland Education

4th Grade Math Review CSI Mystery Worksheets | Grades 4–5 | The Missing School Pet

$4.50 USD

4th grade math review worksheets covering long division, 4 digit addition and subtraction, multi digit multiplication and rounding are all included in this CSI Mystery Detective grade 4 review activity. It is a whole-year math review in a single detective case, perfect for end of year review, back to school spiral review, test prep, math centers, early finishers, homework and sub plans. Completely no prep - just print and go.

What's Inside

Every page reviews a different fourth grade number and operations skill, so one case covers the year:

  • Long division with three-digit dividends and one-digit divisors, every quotient exact: 392 divided by 4, 460 divided by 5, 480 divided by 5
  • Adding and subtracting four-digit and three-digit numbers with the standard algorithm, regrouping on every question: 1,195 + 899, 8,294 - 321, 6,689 - 817
  • Multiplying a two-digit number by a one-digit number and a two-digit number by a two-digit number: 59 x 7, 68 x 5, 73 x 45, 58 x 44
  • Rounding multi-digit whole numbers to any place - the nearest ten, hundred, thousand and ten thousand: 58,316, 6,812, 42,844, 82,969
  • Multiplying two-digit numbers by multiples of ten to trace a route through the evidence maze: 13 x 50, 22 x 30, 89 x 10
  • Reading a suspect chart and using evidence to eliminate suspects one clue at a time

One case to crack - The Missing School Pet - across five pieces of evidence: a coded message, a true-or-false tally chart, a matching page, a round-and-shade page and an evidence maze. Full color and black-and-white versions of every page, and answer keys included.

What is a CSI Mystery Detective?

"It's a print-and-solve math activity - like an escape room without the locks." Students work through math problems to collect evidence, eliminate suspects, and reveal who did it. It combines real skill practice with critical thinking and a detective hook that keeps the whole class engaged.

Every page is self-checking. A wrong answer garbles the coded message or runs the maze into a dead end, so students catch their own mistakes before you do.

When to Use This Resource

  • End of year math review
  • Back to school review and diagnostic warm-ups
  • Test prep and spiral review
  • Math centers and small groups
  • Early finishers
  • Sub days and emergency plans
  • Homework and morning work

Grade Levels

Designed for 4th grade. Also beneficial for struggling 5th grade students who need a confidence-building review of multi-digit computation, and for advanced 3rd grade students ready to move beyond three-digit numbers.

Why Teachers Love CSI Mystery Detective packs

  • Zero prep - print and hand out
  • Self-checking, so students spot their own errors
  • Real computation practice, not a worksheet dressed up
  • A detective hook that holds even reluctant mathematicians
  • Full color and black-and-white versions for easy printing
  • Covers a whole year of number and operations in one activity

Love this resource?

Follow Kiwiland Education to discover more CSI Mystery Detective packs, math review activities, and detective-themed stories for elementary classrooms.

Thank you

Kiwiland Education

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

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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.

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.

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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.

Mystery detective 4th grade 4-digit addition subtraction multiplication division

4th Grade Math Review CSI Mystery Worksheets | Grades 4–5 | The Missing School Pet

$4.50

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