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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

Multiplying Decimals CSI Mystery Worksheets | Grades 4–7 | Zombie Apocalypse

$4.50 USD

Halloween zombie apocalypse CSI math worksheets on multiplying decimals, built for October and the week when the outbreak reaches the classroom. One of the things outside used to be someone your students knew, and this CSI Mystery Detective multiplication mystery for 5th grade and 6th grade identifies it through the numbers it left behind. Students multiply decimals, work multi digit multiplication, and add and subtract large numbers, and every correct answer crosses one suspect off the line-up until a single description fits. Full color and black-and-white pages with answer keys, ready to print and hand straight to desks. They also color the right arrow forward and draw a line through the letter that matters.

The Case: Zombie Apocalypse

The outbreak started at school and finished it. Friends, family and teachers have all gone the same way, and the survivors are barricaded into what is left of the building. One of the things outside used to be someone your students knew. Identifying which one means working the decimals it left behind - how big it is, what it was, how long it has been out there - until only one description fits.

What's Inside

  • Multiplying decimals, with answers running into the thousands
  • Multi-digit multiplication used to color the correct arrow forward
  • A matching page where the line drawn passes through the letter that matters
  • Addition with large multi-digit numbers
  • Addition and subtraction along a path where the final total settles the clue
  • Full color and black-and-white versions of every page
  • Answer keys for the whole case

What Is a CSI Mystery Detective Case?

Every CSI Mystery Detective case runs on the same engine: solve, eliminate, repeat. The class is handed a crime and a page of math worksheets, and the answers cross suspects off one by one until a single name remains. It is a math escape room without locks, apps or preparation of any kind. Because the deduction only closes on correct arithmetic, detective activities get checked by the student rather than by you. As a math activity it fills a lesson, sits in math centers, or runs itself as a sub plan.

When to Use This Resource

  • Decimal review before or after a unit test
  • Halloween week in October, when a normal worksheet will not hold them
  • Math centers, early finishers and independent work
  • Emergency sub plans that run themselves
  • End of year review, when attention is thin and the work still has to happen
  • Whole-class detective sessions, small groups or partner work

Grade Levels

Built for 5th grade, and it carries into 6th and 7th grade for students who need decimal and multiplication review. Fourth graders who have already met decimals can manage it with support, usually working in pairs on the multiplication pages. It also gives older students who are behind on decimal place value something to work on that does not look like remedial work.

Why Teachers Love CSI Mystery Detective Cases

  • Zero prep - print and hand out
  • Self-checking by design, because a wrong answer breaks the deduction
  • Decimal practice students will actually finish
  • Works as a whole lesson, a center, or a filler for an awkward afternoon

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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.

Zombie apocalypse CSI mystery detective decimals grades 4-7

Multiplying Decimals CSI Mystery Worksheets | Grades 4–7 | Zombie Apocalypse

$4.50

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