Math practice · reimagined
Modulo
Turn Modulo into a fight you actually want to win. Every problem is an attack — solve it faster than your opponent and you land the hit.
Ages 7–70 · no download · plays in your browser · 20 languages
How it works
Modulo
Pick a fighter, choose Modulo, and trust your numbers. The faster and cleaner you solve, the harder you hit — from gentle early grades all the way to Olympic-level challenges.
Modulo is just the leftover after dividing — the part that won't split evenly.
17 mod 5 asks: share 17 into groups of 5 — you get 3 groups (15) with 2 left over. So 17 mod 5 = 2. It's the remainder you'd write at the end of a division.
Divide as far as whole groups go, and type what's left.
More math to master
— Quick answers —
Modulo: the short FAQ
- Is the Modulo free to play?
- Yes. The Modulo is free to start right in your browser — no download, no signup. Paid plans later unlock the full fighter roster and the deeper curriculum.
- Who is the Modulo for?
- Anyone from 7 to 70. The early grades stay gentle for beginners, while the higher tiers will make even the confident sweat.
- Do I need to download anything to play the Modulo?
- Nope. The Modulo runs in any browser, and there's a mobile app on the same account if you'd rather train on your phone.
- Can the Modulo be used in the classroom?
- Absolutely. Teachers run the Modulo with a whole class and track who's improving — see the schools plan for per-student pricing and a teacher dashboard.