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 4–99+ · no download · plays in your browser · 23 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.
— Quick answers —
Modulo: the short FAQ
- Is Modulo free to play?
- Yes. Modulo is free to play right in your browser — the whole curriculum, no download, no signup. Paid plans later unlock the full fighter roster, every stage and saved progress.
- Who is Modulo for?
- Anyone from 4 to 99+. 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 Modulo?
- Nope. Modulo runs in any browser, on a laptop, tablet or phone.
- Can Modulo be used in the classroom?
- Absolutely. Teachers run Modulo with a whole class and track who's improving — see the schools plan for per-student pricing and a teacher dashboard.