How to play Sum Hero
A free 1v1 mental maths battle. Sixty seconds, same questions, one winner.
Play free in your browserThe goal
Go head-to-head with another player on the same questions. Outscore them before the 60-second clock hits zero and the win is yours.
The questions
Every question is quick-fire arithmetic inside the 1–12 times tables:
- Addition and subtraction with small numbers, e.g. 5 + 3 or 11 − 4
- Multiplication across the full times tables, e.g. 7 × 9 (up to 12 × 12 = 144)
- Division that always comes out whole, e.g. 63 ÷ 9
Answer fast
Get the answer right to score. The faster you fire it off, the bigger the reward.
| +5 | Under 1.1 seconds |
| +4 | Under 2 seconds |
| +3 | Under 3.5 seconds |
| +2 | Under 5 seconds |
| +1 | Slower than that |
| −1 | Wrong answer (and your streak resets) |
Don't miss: streak bonuses
Chain correct answers to build a streak. Every 5 in a row drops a bonus on top of your points, but one slip wipes the streak.
| +1 | 5 in a row |
| +2 | 10 in a row |
| +4 | 15 in a row |
| +7 | 20 in a row |
| +11 | 25 in a row |
| +16 | 30 in a row, and every 5 after |
Climb the ranks
Every win pushes you up the leaderboard and every loss drags you back. The board resets each week, so climb as high as you can while it counts. Finish near the top to earn exclusive ranked emotes.
Who it's for
Sum Hero is a fast, competitive way to practise times tables and mental arithmetic. It works for kids building number fluency, adults keeping their brain sharp, and teachers looking for a quick classroom warm-up.
Getting started
Open sumhero.online in any browser on your phone, tablet or computer. There's nothing to download and no account needed: pick a name and play as a guest. Sign in with Google to keep your progress across devices. On iPhone you can also get Sum Hero on the App Store.