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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

Addition & Subtraction CSI Mystery Worksheets | Grades 3–6 | The Missing Dragon Eggs

$4.50 USD

Are you looking for an exciting fantasy-themed addition and subtraction activity to engage your 3rd, 4th, or 5th grade students? The Missing Dragon Eggs is a CSI Mystery Detective pack of CSI math worksheets that combines regrouping practice with a magical detective twist—perfect for building number sense, critical thinking, and problem-solving.

In this independent crack-the-code style case, students become detectives solving puzzles to eliminate suspects and find out who stole the dragon eggs. With minimal prep required, this printable activity is ideal for back to school, end of year review, or anytime you want to boost engagement in your classroom or homeschool.

This case includes:

  • Adding multiple 2-digit numbers together
  • Addition of 3-digit numbers
  • Subtraction from 1000
  • 3-digit addition with regrouping
  • 3-digit subtraction from 1000
  • Includes both color and black-and-white versions
  • Answer sheets included

This fun activity is designed for 3rd and 4th grade, but is also great for struggling 5th graders who need review or advanced 2nd graders ready for a challenge. It also works well in homeschool settings, for review, and as an engaging activity for substitute days.

CSI Mystery Detective packs are a unique, low-prep alternative to escape rooms that use puzzles instead of locks. Students must crack the code to solve the case and identify the culprit—keeping them motivated and learning.

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Kiwiland

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

CSI Mystery - Alien Invasion: https://www.teacherspayteachers.com/Product/CSI-Mystery-Alien-Invasion-3789957

CSI Mystery - Zombie Attack: https://www.teacherspayteachers.com/Product/CSI-Mystery-Zombie-Attack-3799849

CSI Mystery - Jungle Juice Fever: https://www.teacherspayteachers.com/Product/CSI-Mystery-Jungle-Juice-Fever-3765647

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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.

The missing dragon eggs addition subtraction mystery detective grades 3-5

Addition & Subtraction CSI Mystery Worksheets | Grades 3–6 | The Missing Dragon Eggs

$4.50

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