1st Grade Math Mystery Worksheets
These free, printable 1st-grade math mystery worksheets turn arithmetic into a whodunit: your child solves adding and subtracting within 20, skip counting, and place value to decode clues and catch the culprit. Every case is verified to have exactly one solution, works on screen or printed, and is free with no login. Make one now →
2 1st grade cases to print
Click any case to solve online or print the PDF + answer key.
More math mysteries
Popular printable cases while we add more 1st grade ones.
Browse more worksheets
By math skill
Other grades
FAQ
Are these 1st grade math mysteries free to print?
Yes — free to solve online and free to download as a printable PDF, with a built-in answer key and no login.
How does a math mystery work?
Kids solve math problems to decode clues, then use the clues to cross suspects off a grid until one culprit remains. The math is the key; the mystery is the motivation.
Can I make a new 1st grade case?
Yes. Generate a brand-new mystery in about a minute — pick the grade, reading level, and interests, and it's verified to have exactly one solution before you print it.
Keep exploring
Free Printable Math Mystery Worksheets (Grades 1–5)
Hundreds of free, printable math mystery worksheets — pick a grade, print the case, and your kid solves math to catch the culprit.
Math Mystery Games for a Kid Who Hates Worksheets
An honest guide to detective-style math for kids who groan at drills — what actually works, and when a mystery beats a game.
Detective Math: Story-Driven Practice for Ages 6–12
How whodunit math turns arithmetic into deduction — the method, the research-backed why, and how to start today for free.