Give your students engaging practice with 3-digit addition and subtraction with regrouping worksheets in a fun Math Mystery format. Designed for 2nd grade, 3rd grade, and 4th grade math, these printable activities combine regrouping practice, problem solving, and mystery stories that capture student interest. Each worksheet begins with a short story, followed by 16 regrouping questions that guide students in eliminating suspects until the mystery is solved.

These math mystery worksheets are ideal for back to school review, math centers, test prep, sub plans, early finishers, seasonal math activities (fall, winter, spring, summer), and end of year review. They can also be used with struggling 5th graders who need reinforcement or advanced 2nd graders ready for enrichment.

What is a Math Mystery?

A Math Mystery is a story-based math activity similar to an escape room or crack-the-code puzzle. Instead of opening locks, students solve math problems, use their answers to eliminate suspects, and uncover the solution. These activities combine math fluency, logical reasoning, and critical thinking while making practice fun and motivating.

What’s Included

• 5 Color Math Mysteries – 3-digit addition with regrouping
• 5 Color Math Mysteries – 3-digit subtraction with regrouping
• 10 Black-and-White Versions – printer-friendly worksheets
• Answer Keys – for quick grading or student self-checking
• Teacher Instructions – print-and-go setup
• 3 Bonus Coloring Pages – for early finishers

Mystery Titles in this Pack

• The Missing Pens
• The Mystery Gift
• The Holiday
• The Missing Hat
• Student Prize
• The Missing Book
• Money Found
• Caught Being Good
• The Missing Ball
• The Class Prize

Why Teachers Love It

• Focused practice on 3-digit addition and subtraction with regrouping
• Mystery stories make math practice fun and engaging
• Perfect for 2nd, 3rd, and 4th grade math, with flexibility for 5th grade review
• Works for January through December – from winter snow days to spring activities, summer review, and fall back-to-school

Make regrouping practice more exciting with these story-driven 3-digit math mystery worksheets that students look forward to solving.

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Kiwiland Education