Description

Celebrate the century mark with this 100th Day of School Math Mystery 4th Grade activity! ‘The Case of the 100 Missing Treats’ is a high-engagement math review that lets older students join the celebration with rigorous, age-appropriate math skills like multiplying by 10 and 100.

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).
• Easel by TPT: Complete the worksheets digitally for seamless online learning.

100th Day of School Math Mystery 4th Grade Activity

To find the missing party snacks, students must unlock five clues by correctly solving a 100-themed math review:

• Clue 1: Balancing Equations (Balancing addition and subtraction to equal 100)
• Clue 2: Missing Addends (Finding the missing number in large sums)
• Clue 3: Multiplying by 10 and 100 (Focus on numbers ending in zero)
• Clue 4: Dividing by 10 and 100 (Understanding patterns in division)
• Clue 5: Place Value (Expanded Form with 5-digit numbers)

Flexible for Any 4th Grade Classroom

Use this versatile 100th Day math worksheets alternative for:

• A fun (but rigorous) 100th Day celebration
• 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 4th Grade Math Review

Q: Is this too “babyish” for 4th Grade?
A: Not at all! Unlike K-2 activities which focus on counting to 100, this mystery focuses on the Power of 10. Students practice multiplying and dividing large numbers by 10 and 100, which aligns perfectly with 4th-grade Place Value standards.

Q: What is “Balancing Equations”?
A: Clue 1 challenges students to ensure both sides of an equation are equal (e.g., 60 + 40 = 150 – 50). This promotes algebraic thinking and reinforces the concept of equality.

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.

Other Grade Editions Available!

Love this ‘100 Missing Treats’ theme? This mystery is also available for other grade levels (great for differentiation)!

• 1st Grade Edition 
• 2nd Grade Edition
• 3rd Grade Edition
• 5th Grade Edition
• 6th Grade Edition

A complete answer key and printable awards are included!