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New Years Activity: 4th Grade New Year's Math Mystery
New Years Activity: 4th Grade New Year's Math Mystery
New Years Activity: 4th Grade New Year's Math Mystery
New Years Activity: 4th Grade New Year's Math Mystery
New Years Activity: 4th Grade New Year's Math Mystery
New Years Activity: 4th Grade New Year's Math Mystery
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New Years Activity: 4th Grade New Year's Math Mystery
New Years Activity: 4th Grade New Year's Math Mystery
New Years Activity: 4th Grade New Year's Math Mystery
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What others say

"This math resource is clear, organized, and flexible for classroom use. The activities reinforce key concepts and encourage student participation. It helps students practice skills and gain confidence in math."
star
Sara C.
"I needed to get the fourth grade version to help some students struggling with some math standards, I appreciate that the clues align, so I can mix and match for student need."
star
Ginger H.

Description

This New Year's Math Mystery, the 'Case of the Millennium Bug' - 4th Grade Edition - will add an exciting twist to your math sessions. This activity will engage and motivate your students to get back into their math work after the holiday break!

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


⭐Optional video hook included for introducing the case! (Check it out in the preview section)

⭐BONUS: Ending video added to wrap up the case!

Students must use their math skills to eliminate suspects to find out who the New Year Hacker is!

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

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: Compare Units of Length (Customary and Metric Options provided)

- CLUE 2: Subtracting LIKE Fractions (simplifying answers required)

- CLUE 3: Addition (5-Digit Numbers with 5-digit numbers)

- CLUE 4: Dividing 3-digit numbers by 1-digit numbers (no remainders)

- CLUE 5: Multiplying 3-digit numbers by 1-digit numbers

Students must use critical thinking skills to figure out what the clue is telling them to eliminate from the list of elf suspects.

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

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.

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

Want different math skills?

The Case of the Millennium Bug is available in the other Grade editions listed below. Click to check out the math skills covered in each packet.

New Year Math Mystery: Case of The Millennium Bug (GRADE 1)

New Year Math Mystery: Case of The Millennium Bug (GRADE 2)

New Year Math Mystery: Case of The Millennium Bug (GRADE 3)

New Year Math Mystery: Case of The Millennium Bug (GRADE 4)

New Year Math Mystery: Case of The Millennium Bug (GRADE 5)

New Year Math Mystery: Case of The Millennium Bug (GRADE 6)

New Year Math Mystery: Case of The Millennium Bug (GRADE 7)

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

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

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

You may also like:

Groundhog Day Math Mystery: Case of the Kidnapped Groundhog

Winter Math Mystery: Case of the Snowman Army

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

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

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.

© 2015

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.

New Years Activity: 4th Grade New Year's Math Mystery

Mrs J's Resource Creations
41.6k Followers
$4.95

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Included

What others say

"This math resource is clear, organized, and flexible for classroom use. The activities reinforce key concepts and encourage student participation. It helps students practice skills and gain confidence in math."
star
Sara C.
"I needed to get the fourth grade version to help some students struggling with some math standards, I appreciate that the clues align, so I can mix and match for student need."
star
Ginger H.

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 $623.17Original Price $890.25Save $267.08
188
Math Mysteries for the HOLIDAYS bundle! 4th Grade Edition. These fun math mystery activities will excite your students about doing math reviews! Save time and money with this Math Mystery HOLIDAY bundle for Grade 4!Easy prep! Just Print &amp; Solve! Or go paperless with the new Google Docs option pr
Price $96.39Original Price $137.70Save $41.31
28
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 $231.97Original Price $331.40Save $99.43
71

Description

This New Year's Math Mystery, the 'Case of the Millennium Bug' - 4th Grade Edition - will add an exciting twist to your math sessions. This activity will engage and motivate your students to get back into their math work after the holiday break!

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


⭐Optional video hook included for introducing the case! (Check it out in the preview section)

⭐BONUS: Ending video added to wrap up the case!

Students must use their math skills to eliminate suspects to find out who the New Year Hacker is!

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

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: Compare Units of Length (Customary and Metric Options provided)

- CLUE 2: Subtracting LIKE Fractions (simplifying answers required)

- CLUE 3: Addition (5-Digit Numbers with 5-digit numbers)

- CLUE 4: Dividing 3-digit numbers by 1-digit numbers (no remainders)

- CLUE 5: Multiplying 3-digit numbers by 1-digit numbers

Students must use critical thinking skills to figure out what the clue is telling them to eliminate from the list of elf suspects.

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

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.

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

Want different math skills?

The Case of the Millennium Bug is available in the other Grade editions listed below. Click to check out the math skills covered in each packet.

New Year Math Mystery: Case of The Millennium Bug (GRADE 1)

New Year Math Mystery: Case of The Millennium Bug (GRADE 2)

New Year Math Mystery: Case of The Millennium Bug (GRADE 3)

New Year Math Mystery: Case of The Millennium Bug (GRADE 4)

New Year Math Mystery: Case of The Millennium Bug (GRADE 5)

New Year Math Mystery: Case of The Millennium Bug (GRADE 6)

New Year Math Mystery: Case of The Millennium Bug (GRADE 7)

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

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

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

You may also like:

Groundhog Day Math Mystery: Case of the Kidnapped Groundhog

Winter Math Mystery: Case of the Snowman Army

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

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

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.

© 2015

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 4.91 out of 5, based on 190 reviews
190
ratings
5
179
4
11
3
0
2
0
1
0
Mostly used with 4th grade
Reviews
5
64
18
1
1
3rd
4th
5th
6th
7th
All verified TPT purchases
Product review
Rated 5 out of 5
May 6, 2026
Met expectations
Great value
Standards-aligned
This math resource is clear, organized, and flexible for classroom use. The activities reinforce key concepts and encourage student participation. It helps students practice skills and gain confidence in math.
Sara C.
24 reviews
Grades taught: 4th
A well-crafted resource
Rated 5 out of 5
March 3, 2026
Met expectations
Great value
Standards-aligned
This resource was excellent to use after a long winter break.
Christi S.
216 reviews • West Virginia
Grades taught: 3rd, 4th, 5th
Fun math activity
Rated 5 out of 5
February 10, 2026
Met expectations
Great value
Standards-aligned
I needed to get the fourth grade version to help some students struggling with some math standards, I appreciate that the clues align, so I can mix and match for student need.
Ginger H.
617 reviews • California
Grades taught: 5th
Student populations: Autism, Emerging bilinguals, Learning difficulties, Mild to severe disabilities
Engaging and Reuseable Resource
Rated 5 out of 5
January 6, 2026
Met expectations
Great value
Standards-aligned
I continue to use this resource every new year! Love the intro and ending videos, too! Always a hit with students and a perfect review of skills learned to date.
Jennifer B.
193 reviews • Washington
Grades taught: 4th
Rated 5 out of 5
July 26, 2025
This is a great resource! It's a fun way to review math skills. My students really enjoyed this mystery!
Kara B.
317 reviews
Grades taught: 4th
Rated 4 out of 5
June 11, 2025
Great resource. Good for review independently or together as a class. Perfect for low prep sub days.
Shea L.
176 reviews
Grades taught: 4th
Student populations: Emerging bilinguals, Learning difficulties
Rated 5 out of 5
June 4, 2025
I am a primary teacher, but I tutor for older students. When the parent asked for homework, I found your store. These have been such a lifesaver. The kids love math mysteries, and look forward to completing them. It is a win win scenario. Thank you!
Blueberry Patch
(TPT Seller)
822 reviews
Grades taught: 4th, 5th
Rated 5 out of 5
May 15, 2025
Math Mysteries are a HIT in my room! I love using these as reviews or for early finisher work.
Jenny R.
68 reviews
Grades taught: 4th

Questions & Answers

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Standards

to see state-specific standards (only available in the US).
Know relative sizes of measurement units within one system of units including km, m, cm; kg, g; lb, oz.; l, ml; hr, min, sec. Within a single system of measurement, express measurements in a larger unit in terms of a smaller unit. Record measurement equivalents in a two-column table. For example, know that 1 ft is 12 times as long as 1 in. Express the length of a 4 ft snake as 48 in. Generate a conversion table for feet and inches listing the number pairs (1, 12), (2, 24), (3, 36),...
Fluently add and subtract multi-digit whole numbers using the standard algorithm.
Multiply a whole number of up to four digits by a one-digit whole number, and multiply two two-digit numbers, using strategies based on place value and the properties of operations. Illustrate and explain the calculation by using equations, rectangular arrays, and/or area models.
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