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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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Kiwiland Education

Long Division CSI Mystery Worksheets | Grades 4–6 | The Divided Monster

$4.50 USD

Long division practice worksheets, division with remainders activities, and multi-digit division word problems for 4th grade and 5th grade are all included in this printable CSI Mystery Detective case. Students divide 3-digit and 4-digit numbers by a 1-digit divisor, with and without remainders, in a pack built for math centers, early finishers, sub days, homework and end-of-unit review - completely no prep, just print and go.

Long division is the skill students most want to give up on, and the one that rewards repetition most. This case hides the repetition inside a mystery, so a class that groans at a page of quotients will work through the whole set to find out who did it.

What's Included in This Case?

  • Division basic facts through 12, so recall is warm before the algorithm starts
  • Dividing 3-digit numbers by a 1-digit divisor with no remainders
  • Dividing 4-digit numbers by a 1-digit divisor with no remainders
  • Dividing 4-digit numbers by a 1-digit divisor with remainders, and what the remainder means
  • Division word problems, where students decide what to divide before they divide it
  • Answer keys for every page

One case to crack, solved clue by clue as the division gets harder.

What Is a CSI Mystery Detective?

A CSI Mystery Detective is a print-and-solve math activity - an escape room without the locks. Students work through math problems to collect evidence, eliminate suspects and reveal who did it, so real skill practice comes wrapped in a detective hook that keeps the whole class engaged. The pages check themselves: a wrong answer stops the mystery in its tracks, so students go back and find their own mistake before it ever reaches your marking pile.

About This Case

Something very strange has happened at Monster School. A student named Squirmy has been split into two conflicting parts, and nothing he does works properly any more. Principal Spookington needs a detective who can divide carefully enough to work out who is behind it.

When to Use This Resource

  • Math centers and rotations
  • Independent long division practice and morning work
  • Early finisher and enrichment folders
  • Emergency sub days - hand it over and it runs itself
  • RTI, intervention and small-group work
  • Homework and homeschool lessons
  • End-of-unit review, test prep and the last weeks of the year

Grade Levels

Designed for 4th and 5th grade. The basic facts and 3-digit pages give 3rd graders moving into long division a way in, and the 4-digit and remainder pages give 6th graders who still need the algorithm real practice without a babyish worksheet.

Why Teachers Love CSI Mystery Detectives

  • Zero prep - print and hand out
  • Self-checking, so students catch their own errors
  • Prints clean in black and white
  • Holds the attention of students who avoid long division
  • Real standards-aligned division practice, not busy work

Save with the bundle: CSI Multiplication and Division Fun, 3rd 4th 5th Grade Worksheets

https://www.teacherspayteachers.com/Product/CSI-Mystery-Multiplication-and-Division-Fun-3rd-4th-5th-Grade-Worksheets-11990804

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Follow Kiwiland Education to discover more CSI Mystery Detectives, division and multiplication practice packs, and detective-themed stories for elementary classrooms.

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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.

Long division worksheets mystery detective the divided monster school

Long Division CSI Mystery Worksheets | Grades 4–6 | The Divided Monster

$4.50

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