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Decimals Math Mystery Game Activity:  Adding, Subtracting, Multiplying Decimals
Decimals Math Mystery Game Activity:  Adding, Subtracting, Multiplying Decimals
Decimals Math Mystery Game Activity:  Adding, Subtracting, Multiplying Decimals
Decimals Math Mystery Game Activity:  Adding, Subtracting, Multiplying Decimals
Decimals Math Mystery Game Activity:  Adding, Subtracting, Multiplying Decimals
Decimals Math Mystery Game Activity:  Adding, Subtracting, Multiplying Decimals
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Decimals Math Mystery Game Activity:  Adding, Subtracting, Multiplying Decimals
Decimals Math Mystery Game Activity:  Adding, Subtracting, Multiplying Decimals
Decimals Math Mystery Game Activity:  Adding, Subtracting, Multiplying Decimals
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What others say

"This was used for extra practice. Students enjoyed answering the problems to read the clues to find the answer."
star
Sandy L.
"This decimal review activity was perfect for students while others were working on completing their diagnostics. It was perfect for the end of year to help students review for their last test this year!"
star
Leah K.

Description

This decimals math mystery activity covers rounding, adding, subtracting, comparing, and multiplying skills. This fun activity will engage and motivate your class while getting lots of decimal practice! Students will use their math skills to solve the Case of The Disappearing Donuts.

Easy prep! Just Print & Solve! Or go paperless with the new Google Slides option provided within your download.

A video hook is provided to set the stage to engage! Check out the video hook in the preview section.

A bonus ENDING VIDEO clip is included to celebrate finishing the mystery.

(Update - voice-overs added to the videos)

Distance Learning Update: I've added a Word Document in the folder containing a Google Slides link to share this resource with your students via Google Classroom or Drive. Parts of the pages are editable, so your students can complete them without printing the pages. Please note you will need to make a copy of the Google Slides to your drive before you can edit.

Preparation

- No Prep required! Print the student pages, staple or place

them in a folder, and your students are set to go.

- Have the video hook ready for viewing at the start of the

lesson on an IWB, iPad, or computer monitor screen.

-----------------------------------------------------------------------------------------------

Math Skills Required to Unlock Clues

There are five clues to crack to solve the mystery:

  • Clue 1: Comparing Decimals (tenths, hundredths, and thousandths place values)
  • Clue 2: Multiplying and Dividing Decimals by Powers of 10
  • Clue 3: Rounding Decimals (wholes, tenths, hundredths, thousandths)
  • Clue 4: Adding and Subtracting Decimals (hundredths)
  • Clue 5: Multiplying Decimals by Whole Numbers (tenths and hundredths with whole numbers from 2-12)

Students must use critical thinking skills to determine what the clue tells them to eliminate from the list of possibilities.

----------------------------------------------------------------------------------------------

Multiple Uses

- Suitable for independent, pairs, or group work.

- Use as part of your math centers, add to your sub tubs, make it part of your early finisher tasks, give for homework, or make it part of your classroom practice/review sessions.

I recommend pacing this activity by giving students one clue at a time. Once the whole class has completed a clue, then move on to the next clue either within the same lesson or the next math session. New math content presented? Make a lesson out of it by modeling the math before diving into the clue. I like to say, "We must learn something new before attempting the next clue."

-----------------------------------------------------------------------------------------------

How long will this activity take?

Time to complete will vary anywhere between 30mins - 2 hours or more! It mainly depends on how familiar your students are with the math mystery formatand how difficult they find math skills covered in the particular mystery. Please check the math skills outlined in the clues above to help determine suitability for your class.

-----------------------------------------------------------------------------------------------

- Select a higher-grade version of this mystery if you want more challenging math skills.

- If you would like a set of easier math skills, select a lower-grade level version of this mystery.

This Decimals Math Mystery activity is also available for the other grade levels listed below:

----------------------------------------------------------------------------------------------

Add extra motivation with this Detective Rank Chart Download the Mystery Record & Rank Chart FREEBIE HERE

----------------------------------------------------------------------------------------------

Bundle and Save!

COMPLETE Math Mystery Bundle for GRADE 5

Holiday Math Mystery Bundle {GRADE 5}

Seasons Math Mystery Bundle Pack (GRADE 5)

----------------------------------------------------------------------------------------------------------------

Not sure what a math mystery is? CLICK HERE to watch a video about Math Mysteries

TRY A FULL FREE MATH MYSTERY HERE (GRADES 1 - 6 DIFFERENTIATED BUNDLE)

Browse the 5th Grade Range:

>>Download the FREE 5th Grade Math Mystery Checklist here<<

--------

For more ideas, activities, and resources, follow my store (by clicking the little green star) to stay updated on new releases. We can also stay connected via:

Blog

Pinterest

Facebook

_________________________________________________________________

>> CLICK HERE to follow my store <<

_________________________________________________________________

Thank you!

Mrs. J.

© 2018

Report this resource to TPT
Reported resources will be reviewed by our team. Report this resource to let us know if this resource violates TPT's content guidelines.
10+ views in the last 24 hours

Decimals Math Mystery Game Activity: Adding, Subtracting, Multiplying Decimals

Mrs J's Resource Creations
41.6k Followers
$4.95

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Digital downloads
Grades icon
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Answer Key
Included

What others say

"This was used for extra practice. Students enjoyed answering the problems to read the clues to find the answer."
star
Sandy L.
"This decimal review activity was perfect for students while others were working on completing their diagnostics. It was perfect for the end of year to help students review for their last test this year!"
star
Leah K.

Save even more with bundles

This Complete Math Mystery Tri-Grade Bundle contains all of my math mysteries currently in the range available for Grades 4, 5, and 6!Make math fun and exciting by adding a mystery twist to your worksheets. Your students will gain lots of math practice while also developing their critical thinking a
Price $626.63Original Price $895.20Save $268.57
189
Math Mystery COMPLETE 5th Grade Edition collection! This complete math mystery bundle contains all of my math mysteries for Grade 5 up to date! Make math fun and exciting with these engaging activities that will motivate even some of your most reluctant learners.Easy prep! Just Print &amp; Solve! Or
Price $217.81Original Price $311.15Save $93.34
67
This SKILLS math mystery bundle contains all of my skill/concepts focused math mysteries for 5th Grade up to date! Make math fun and exciting with these engaging activities that will motivate even some of your most reluctant learners.Easy prep! Just Print &amp; Solve! Or go paperless with the new Go
Price $98.32Original Price $122.90Save $24.58
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Description

This decimals math mystery activity covers rounding, adding, subtracting, comparing, and multiplying skills. This fun activity will engage and motivate your class while getting lots of decimal practice! Students will use their math skills to solve the Case of The Disappearing Donuts.

Easy prep! Just Print & Solve! Or go paperless with the new Google Slides option provided within your download.

A video hook is provided to set the stage to engage! Check out the video hook in the preview section.

A bonus ENDING VIDEO clip is included to celebrate finishing the mystery.

(Update - voice-overs added to the videos)

Distance Learning Update: I've added a Word Document in the folder containing a Google Slides link to share this resource with your students via Google Classroom or Drive. Parts of the pages are editable, so your students can complete them without printing the pages. Please note you will need to make a copy of the Google Slides to your drive before you can edit.

Preparation

- No Prep required! Print the student pages, staple or place

them in a folder, and your students are set to go.

- Have the video hook ready for viewing at the start of the

lesson on an IWB, iPad, or computer monitor screen.

-----------------------------------------------------------------------------------------------

Math Skills Required to Unlock Clues

There are five clues to crack to solve the mystery:

  • Clue 1: Comparing Decimals (tenths, hundredths, and thousandths place values)
  • Clue 2: Multiplying and Dividing Decimals by Powers of 10
  • Clue 3: Rounding Decimals (wholes, tenths, hundredths, thousandths)
  • Clue 4: Adding and Subtracting Decimals (hundredths)
  • Clue 5: Multiplying Decimals by Whole Numbers (tenths and hundredths with whole numbers from 2-12)

Students must use critical thinking skills to determine what the clue tells them to eliminate from the list of possibilities.

----------------------------------------------------------------------------------------------

Multiple Uses

- Suitable for independent, pairs, or group work.

- Use as part of your math centers, add to your sub tubs, make it part of your early finisher tasks, give for homework, or make it part of your classroom practice/review sessions.

I recommend pacing this activity by giving students one clue at a time. Once the whole class has completed a clue, then move on to the next clue either within the same lesson or the next math session. New math content presented? Make a lesson out of it by modeling the math before diving into the clue. I like to say, "We must learn something new before attempting the next clue."

-----------------------------------------------------------------------------------------------

How long will this activity take?

Time to complete will vary anywhere between 30mins - 2 hours or more! It mainly depends on how familiar your students are with the math mystery formatand how difficult they find math skills covered in the particular mystery. Please check the math skills outlined in the clues above to help determine suitability for your class.

-----------------------------------------------------------------------------------------------

- Select a higher-grade version of this mystery if you want more challenging math skills.

- If you would like a set of easier math skills, select a lower-grade level version of this mystery.

This Decimals Math Mystery activity is also available for the other grade levels listed below:

----------------------------------------------------------------------------------------------

Add extra motivation with this Detective Rank Chart Download the Mystery Record & Rank Chart FREEBIE HERE

----------------------------------------------------------------------------------------------

Bundle and Save!

COMPLETE Math Mystery Bundle for GRADE 5

Holiday Math Mystery Bundle {GRADE 5}

Seasons Math Mystery Bundle Pack (GRADE 5)

----------------------------------------------------------------------------------------------------------------

Not sure what a math mystery is? CLICK HERE to watch a video about Math Mysteries

TRY A FULL FREE MATH MYSTERY HERE (GRADES 1 - 6 DIFFERENTIATED BUNDLE)

Browse the 5th Grade Range:

>>Download the FREE 5th Grade Math Mystery Checklist here<<

--------

For more ideas, activities, and resources, follow my store (by clicking the little green star) to stay updated on new releases. We can also stay connected via:

Blog

Pinterest

Facebook

_________________________________________________________________

>> CLICK HERE to follow my store <<

_________________________________________________________________

Thank you!

Mrs. J.

© 2018

Report this resource to TPT
Reported resources will be reviewed by our team. Report this resource to let us know if this resource violates TPT's content guidelines.

Reviews

4.9
Rated 4.88 out of 5, based on 1770 reviews
1770
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5
1,640
4
123
3
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Met expectations
100%
Is a great value
100%
Is standards-aligned
100%
All verified TPT purchases
Great Resource
Rated 5 out of 5
May 22, 2026
Met expectations
Great value
Standards-aligned
This was used for extra practice. Students enjoyed answering the problems to read the clues to find the answer.
Sandy L.
148 reviews • Michigan
Grades taught: 5th
Donut Decimals
Rated 5 out of 5
May 20, 2026
What a fun way to practice multiplying decimals. My students loved solving the mystery.
Lori S.
190 reviews • New Jersey
Grades taught: 3rd
Perfect for Independent Review
Rated 5 out of 5
May 7, 2026
Met expectations
Great value
This decimal review activity was perfect for students while others were working on completing their diagnostics. It was perfect for the end of year to help students review for their last test this year!
Leah Kissinger
(TPT Seller)
15 reviews
Grades taught: 5th
Student populations: Learning difficulties, Mild to severe disabilities
Always Fun and Engaging
Rated 5 out of 5
May 6, 2026
Met expectations
Great value
Standards-aligned
My students loved the theme and the videos that accompany as they solve the mystery. Great review!
Celia C.
376 reviews • Nevada
Grades taught: 5th
Love for Review!
Rated 5 out of 5
May 6, 2026
Met expectations
Great value
Standards-aligned
My students love these as a review of our learning before a test. They are engaged the entire time and especially love the videos that are included.
Melissa M.
65 reviews
Grades taught: 5th
Always a hit!
Rated 5 out of 5
April 30, 2026
Met expectations
Great value
Standards-aligned
I always come back to this resource because both the students and I enjoy this! It's engaging while giving the appropriate practice students need!
Julie C.
134 reviews • California
Grades taught: 5th
Great resource
Rated 5 out of 5
April 22, 2026
This was a great classroom resource! My students benefitted from the practice this entailed.
359 reviews • Montana
Grades taught: K, 1st, 2nd, 3rd, 4th, 5th
Student populations: Autism, Learning difficulties, Mild to severe disabilities
Fun and Engaging
Rated 5 out of 5
April 20, 2026
Met expectations
Great value
Standards-aligned
I love these mysteries for my classroom and decided to try it for my tutoring student. It worked great and kept the student engaged and invested in solving the math problems.
Kristina M.
594 reviews • Michigan
Grades taught: 5th

Questions & Answers

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Standards

to see state-specific standards (only available in the US).
Recognize that in a multi-digit number, a digit in one place represents 10 times as much as it represents in the place to its right and 1/10 of what it represents in the place to its left.
Explain patterns in the number of zeros of the product when multiplying a number by powers of 10, and explain patterns in the placement of the decimal point when a decimal is multiplied or divided by a power of 10. Use whole-number exponents to denote powers of 10.
Compare two decimals to thousandths based on meanings of the digits in each place, using >, =, and < symbols to record the results of comparisons.
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