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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

Summer Addition & Subtraction CSI Mystery Worksheets | Grades 2–5 | The Missing Skates

$4.50 USD

3rd grade and 4th grade 3 digit addition CSI math worksheets, dressed as a back to school and summer review CSI Mystery Detective case that earns a second run in March when addition needs tightening before testing. 4 digit addition is in there too, so it doubles as 4th grade math review. Nothing to prepare beyond pressing print: color and black and white versions, answer keys for every page. The case is The Missing Roller Skates - in the bag last night, gone this morning - and your students have until the rink opens to solve the mystery. Answers pick letters off a map and settle an odd-or-even trail, ruling out a suspect each time.

The Case: The Missing Roller Skates

Your best friend has invited you to the rink and you have not been skating in years. You get dressed, find your bag, and the skates are not in it. They were there last night. Somebody has been through the bag between then and now, and the whole afternoon depends on your students working out who it was before the session starts.

What's Inside

  • 3 digit and 4 digit addition, with answers used to pick letters off a map
  • A matching page where the line drawn passes through the letter that matters
  • Addition decoded through a letter key to reveal the next part of the description
  • Addition along a path where an odd or even final total decides the answer
  • A suspect line-up that narrows every time a clue is solved
  • Full color and black-and-white versions of every page
  • Answer keys for the whole case

What Is a CSI Mystery Detective Case?

Each page asks one question about the thief - the gender, the age, the height, the shoe size - and hands your students the addition that answers it. They solve, they cross a name off the line-up, and the case closes when one suspect is left. A careless answer sends the description the wrong way, so students check their own work properly.

When to Use This Resource

  • End of year review in June and July, when attention is thin
  • Summer school and holiday review packets
  • The first weeks back at school in August and September
  • Math centers, early finishers and independent work
  • Emergency sub plans that run themselves

Grade Levels

Built for 3rd grade and 4th grade. Third graders usually pair up on the four-digit pages; fourth graders run the whole case independently inside a lesson. It also suits 2nd grade students who are ahead on addition and want something with more thinking in it than extra practice.

Why Teachers Love CSI Mystery Detective Cases

  • Zero prep - print and hand out
  • Self-checking by design, because a wrong answer breaks the deduction
  • Addition 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 End of Year and Summer Activities

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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.

Summer mystery detective addition and subtraction 1

Summer Addition & Subtraction CSI Mystery Worksheets | Grades 2–5 | The Missing Skates

$4.50

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