Math practice · reimagined
Addition
Turn Addition 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
Addition
Pick a fighter, choose Addition, 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.
Adding means putting things together and counting how many you have in all.
If you hold 2 pears in one hand and 3 pears in the other, how many pears do you have altogether? Count them: 1, 2… 3, 4, 5. That's 5 pears. So 2 + 3 = 5.
You can use your fingers — start at the first number and count up. Type the total and swing!
— Quick answers —
Addition: the short FAQ
- Is the Addition free to play?
- Yes. The Addition 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 Addition 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 Addition?
- Nope. The Addition runs in any browser, and there's a mobile app on the same account if you'd rather train on your phone.
- Can the Addition be used in the classroom?
- Absolutely. Teachers run the Addition with a whole class and track who's improving — see the schools plan for per-student pricing and a teacher dashboard.