Description

Celebrate the finish line with this End of Year Math 3rd Grade activity! ‘The Case of the Graduation Gremlins’ is a high-engagement math review that keeps students focused and learning during the chaotic final weeks of school.

It’s the perfect no-prep math activity! This resource is loaded with options, including an optional video hook and a NEW ending video (with voiceovers!) to wrap up the case!

Easy Prep for Print or Digital

This resource is designed to be low-prep for you and high-engagement for your students.

• Printable PDF Version: Just print the worksheets, staple, and go.
• Google Slides Digital Version: 100% paperless! Simply assign in Google Classroom. (Students must be in ‘edit mode’ to type).

End of Year Math 3rd Grade Activity

To stop the Gremlins from ruining the ceremony, students must unlock five clues by correctly solving a complete math review:

• Clue 1: Mixed Operations (Add, Subtract, Multiply, and Divide)
• Clue 2: Perimeter (Find the missing side length – Metric & Imperial options)
• Clue 3: Reducing Fractions to Lowest Terms
• Clue 4: Time Patterns (Completing the sequence)
• Clue 5: Addition Standard Algorithms (3-digit numbers)

Flexible for Any 3rd Grade Classroom

Use this versatile 3rd grade math review activity for:

• A fun “Last Week of School” party activity
• Math centers or stations
• Homework or enrichment
• Your “early finisher” tub
• A lifesaver for your sub-tub!

Pacing & Timing

This is a comprehensive review that can take anywhere from 30 minutes to 2+ hours, depending on your students’ skill level. We recommend pacing it by one clue at a time.

Common Questions for this 3rd Grade Math Review

Q: What skills does this mystery cover?
A: This is a rigorous review. Students will practice finding missing sides in perimeter, solving time patterns, and the challenging skill of reducing fractions.

Q: Is this better than a normal worksheet?
A: Absolutely. Standard end of year math worksheets often get ignored as summer excitement builds. This activity adds a narrative, a suspect list, and video hooks to keep students motivated to finish the work.

Q: How does differentiation work with these?
A: That’s our secret weapon! Many of our stories are available for other grades, so you can “clue swap” with the 2-6 grade packs. We even have a blog post explaining how: learn how to differentiate here.

Your 3rd Grade End of Year Hub

Don’t stop at just one mystery! Check out our other 3rd Grade End of Year & Summer Math Mysteries:

• The Case of The Mathhattan Meltdown (Summer Theme)
• The Case of The Missing Campers (Summer Theme)
• See Other 3rd Grade Math Mysteries