TPT
Total:
$0.00
Decimals Math Mystery: Comparing Decimals, Converting Decimals to Fractions, +
Decimals Math Mystery: Comparing Decimals, Converting Decimals to Fractions, +
Decimals Math Mystery: Comparing Decimals, Converting Decimals to Fractions, +
Decimals Math Mystery: Comparing Decimals, Converting Decimals to Fractions, +
Decimals Math Mystery: Comparing Decimals, Converting Decimals to Fractions, +
Decimals Math Mystery: Comparing Decimals, Converting Decimals to Fractions, +
Loading
Decimals Math Mystery: Comparing Decimals, Converting Decimals to Fractions, +
Decimals Math Mystery: Comparing Decimals, Converting Decimals to Fractions, +
Decimals Math Mystery: Comparing Decimals, Converting Decimals to Fractions, +
Share

What others say

"This was perfect for our unit of study. It covered all the standards we were working on. The kids were engaged, and the rigor was just right!!"
star
Yvette E.
"My students looked forward to these activities each time I give them out. Such a great resource to reenforce a lesson on decimals and fractions."
star
Lindsey M.

Description

This decimals review covers comparing, ordering, converting, and writing decimals. It is a fun math mystery activity designed to engage and motivate your class while getting lots of decimal practice! Perfect for review, test practice, early finishers, or the sub-tub. 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. 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)
  • Clue 2: Convert Fractions to Decimals (Denominators of 10 and 100 only)
  • Clue 3: Convert Decimals to Fractions (Denominators of 10 and 100 only)
  • Clue 4: Writing Decimals from Models (tenths, hundredths)
  • Clue 5: Ordering Decimals (tenths, hundredths)

Students must use critical thinking skills to figure out what the clue is telling 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 format and 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.

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 4

Holiday Math Mystery Bundle {GRADE 4}

Seasons Math Mystery Bundle Pack (GRADE 4)

SKILLS Math Mystery Bundle (4th Grade)

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

Not sure what a math mystery is? CLICK HERE to watch a video about Math Mysteries or read this blog post: What is a Math Mystery?

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

Browse the 4th Grade Range:

>>Download the FREE 4th 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.

Decimals Math Mystery: Comparing Decimals, Converting Decimals to Fractions, +

Mrs J's Resource Creations
41.9k Followers
$4.95

Highlights

Digital downloads
Grades icon
Grades
Standards icon
Standards
Pages
17
Answer Key
Included

What others say

"This was perfect for our unit of study. It covered all the standards we were working on. The kids were engaged, and the rigor was just right!!"
star
Yvette E.
"My students looked forward to these activities each time I give them out. Such a great resource to reenforce a lesson on decimals and fractions."
star
Lindsey M.

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 $637.02Original Price $910.05Save $273.03
192
Math Mysteries, the COMPLETE collection for 4th Grade. This complete math mystery bundle contains all of my math mysteries for Grade 4 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!
Price $238.89Original Price $341.30Save $102.41
73
This SKILLS math mystery bundle contains all of my skill/concept focused math mysteries for Grade 4 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 Googl
Price $86.04Original Price $122.90Save $36.86
25

Description

This decimals review covers comparing, ordering, converting, and writing decimals. It is a fun math mystery activity designed to engage and motivate your class while getting lots of decimal practice! Perfect for review, test practice, early finishers, or the sub-tub. 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. 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)
  • Clue 2: Convert Fractions to Decimals (Denominators of 10 and 100 only)
  • Clue 3: Convert Decimals to Fractions (Denominators of 10 and 100 only)
  • Clue 4: Writing Decimals from Models (tenths, hundredths)
  • Clue 5: Ordering Decimals (tenths, hundredths)

Students must use critical thinking skills to figure out what the clue is telling 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 format and 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.

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 4

Holiday Math Mystery Bundle {GRADE 4}

Seasons Math Mystery Bundle Pack (GRADE 4)

SKILLS Math Mystery Bundle (4th Grade)

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

Not sure what a math mystery is? CLICK HERE to watch a video about Math Mysteries or read this blog post: What is a Math Mystery?

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

Browse the 4th Grade Range:

>>Download the FREE 4th 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 4.93 out of 5, based on 825 reviews
825
ratings
5
766
4
59
3
0
2
0
1
0
Mostly used with 4th grade
Reviews
3
3
6
40
483
112
20
K
1st
2nd
3rd
4th
5th
6th
What customers are saying
Met expectations
100%
Is a great value
100%
Is standards-aligned
100%
All verified TPT purchases
Nice Revision Activity
Rated 5 out of 5
July 14, 2026
Met expectations
Great value
Standards-aligned
I cannot say enough good things about these math mysteries! I have used them across different strands of maths and in different year groups and they are always a hit! They love the opening and closing videos and I love the reading component too. Always will recommend!
Rebecca N.
37 reviews • Outside the United States
Grades taught: 4th
Great resource
Rated 5 out of 5
July 11, 2026
Met expectations
Great value
Standards-aligned
I have used several of these activities and my kids always look forward to them.
Jennifer A.
63 reviews • New Mexico
Grades taught: 4th
Great resource
Rated 5 out of 5
July 9, 2026
My students enjoyed using this resource. I was able to choose which parts worked for our class.
Kelly D.
526 reviews • Ohio
Grades taught: 4th
Just What I Needed
Rated 5 out of 5
July 6, 2026
Met expectations
Great value
Standards-aligned
This was perfect for our unit of study. It covered all the standards we were working on. The kids were engaged, and the rigor was just right!!
Yvette E.
1,525 reviews • California
Grades taught: 3rd, 4th, 5th
Thank you.
Rated 5 out of 5
June 30, 2026
Thank you. Great resource. Well organized. Creative
Rachel K.
1,259 reviews • Illinois
Grades taught: 3rd, 4th, 5th
Thank you!
Rated 5 out of 5
June 24, 2026
Thank you! My students loved using this resource in our classroom.
Samantha R.
378 reviews • Mississippi
Grades taught: 3rd, 4th, 5th
Dont- u it was great.
Rated 5 out of 5
June 23, 2026
All my classes enjoy your resources. I use it for missed prep or Fun Friday.
Carol McElwee
(TPT Seller)
1,317 reviews • New York
Grades taught: 4th, 5th
Love this math mystery!
Rated 5 out of 5
June 18, 2026
Met expectations
Great value
Standards-aligned
My students looked forward to these activities each time I give them out. Such a great resource to reenforce a lesson on decimals and fractions.
Lindsey M.
11 reviews • California
Grades taught: 4th
Student populations: Learning difficulties

Questions & Answers

Loading

Standards

to see state-specific standards (only available in the US).
Use decimal notation for fractions with denominators 10 or 100. For example, rewrite 0.62 as 62/100; describe a length as 0.62 meters; locate 0.62 on a number line diagram.
Compare two decimals to hundredths by reasoning about their size. Recognize that comparisons are valid only when the two decimals refer to the same whole. Record the results of comparisons with the symbols >, =, or <, and justify the conclusions, e.g., by using a visual model.
Loading