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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

Fractions CSI Mystery Worksheets | Grades 3–6 | Fraction Finders: The City Quest

$4.50 USD

Fraction word problems, simplest form and mixed numbers for 5th grade, run as a CSI Mystery Detective treasure quest under the city. The tunnels are dark and full of decisions, and every one is settled by a fraction: word problems decide which way to turn, simplest form gets students past the traps, and improper fractions turned into mixed numbers tell them how far is left to walk. The CSI math worksheets come in color and black and white with answer keys, ready to print for February. Students circle letters on a grid using fraction answers to reveal a direction, and one last fraction problem settles the mystery.

The Case: The City Quest

There has always been talk of treasure somewhere under the city. Plenty of people have gone looking for it over the years, and none of them have come back to say whether the stories are true. Your students have decided to go anyway. The passages below the city are dark and full of decisions, and the only thing down there that can be trusted is the math.

What's Inside

  • Fraction word problems that decide which way to turn at a junction
  • Circling letters on a grid using fraction answers to reveal a direction
  • Converting fractions to their simplest form to get past the traps
  • Converting improper fractions to mixed numbers and reading the whole number
  • A final fraction problem that settles how far there is left to walk
  • Full color and black-and-white versions of every page
  • Answer keys for the whole case

What Is a CSI Mystery Detective Case?

A CSI Mystery Detective case is what a math escape room becomes when you take the locks away and keep the deduction. Students solve, strike a suspect off the line-up, and keep narrowing until one name is left. Nothing to cut, nothing to install, nothing to prepare. Unlike ordinary math worksheets it cannot be drifted through, because an error leaves more than one suspect standing and the class can see it. A math activity that fills a lesson, suits math centers, and works as detective activities for early finishers.

When to Use This Resource

  • Fraction review before or after a unit test
  • 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 works across 4th grade and 6th grade depending on where your class is with fractions. Fourth graders usually need support on the improper fraction pages; sixth graders finish it inside a lesson and treat it as revision.

Why Teachers Love CSI Mystery Detective Cases

  • Zero prep - print and hand out
  • Self-checking by design, because a wrong answer breaks the deduction
  • Fraction 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.

More like this

From CSI Mysteries

See all CSI Mysteries

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.

Fraction word problems city quest CSI mystery detective grades 3-6

Fractions CSI Mystery Worksheets | Grades 3–6 | Fraction Finders: The City Quest

$4.50

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