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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.

Verified buyer

"My students loved this resource! They were engaged and were able to complete the tasks with ease."

Gina H.

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

Karen C.

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Kiwiland Education

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

$4.50 USD

Are you looking for addition and subtraction math activities wrapped inside a CSI Mystery Detective? Then these addition with regrouping worksheets and mixed word problems are for you. Although this has a summer theme, it is also perfect for end-of-year math review, seasonal spiral practice, and back-to-school math centers.

Capture your students' attention with this CSI Mystery Detective by taking them on a journey to solve addition and subtraction problems and puzzles. Students narrow down the possible options by completing the activities and worksheets and marking them off until one person is left. Can you find that person?

This detective case includes:

  • Subtraction from 100 of 2-digit numbers
  • 3-digit addition with regrouping
  • Addition and subtraction with 3 digits
  • Multi-digit addition
  • Word problems with addition and subtraction
  • Includes color and black and white versions

These Mystery Detectives are designed for 2nd, 3rd, and 4th grade students. They can also be used with struggling 5th grade students who need a little extra work and reinforcement in adding and takeaways—or to challenge gifted and talented 2nd graders. These printable math puzzles are also great to leave for a sub or to use for no-prep math review days.

CSI Mystery Detective packs are an independent escape room or crack the code type of fun math activity where instead of using locks, students identify suspects with puzzles and word problems. This mystery is perfect for the start of the year with back-to-school problem solving activities and printable math detective fun.

Love this resource? Follow Kiwiland Education to discover more CSI Mystery Detective packs and receive updates, discounts, and exciting new printables for your classroom.

Thank you

Kiwiland

If you are interested in this product and your students enjoy mysteries, I have additional resources that will complement this one.

CSI Mystery Detective - Alien Invasion

CSI Mystery Detective - Zombie Attack

CSI Mystery Detective - Jungle Juice Fever

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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.

Addition and subtraction 1

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

$4.50

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