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 4–99+ · no download · plays in your browser · 23 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!
Every level of Addition
- T1Basic sumsK · ages 4-5Single-digit addition.Play free ▸
- T2Two-digitGrade 1 · 6 yrsAdd 10–49.Play free ▸
- T3Three at onceGrade 2 · 7 yrsSum of three two-digit numbers.Play free ▸
- T4Three-digitGrade 2 · 7 yrsAdd 100–499.Play free ▸
- T5Massive sumsGrade 4 · 9 yrsThree numbers, 1000–99999.Play free ▸
- T6Mega sumsOLYMPICSeven numbers, 1000000–9999999.Play free ▸
- T7Within twentyGrade 1 · 6 yrsSums that cross the ten.Play free ▸
- T8Within a hundredGrade 2 · 7 yrsTwo-digit sums that carry.Play free ▸
— Quick answers —
Addition: the short FAQ
- Is Addition free to play?
- Yes. Addition 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 Addition 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 Addition?
- Nope. Addition runs in any browser, on a laptop, tablet or phone.
- Can Addition be used in the classroom?
- Absolutely. Teachers run Addition with a whole class and track who's improving — see the schools plan for per-student pricing and a teacher dashboard.