Find the Sum
Spot the sum. Beat your record.
A fast, colourful mental-maths game that trains kids to add in their heads, and to do it quickly.
Coming soon to Google PlayTry it right here
Nine numbers. Exactly one is the sum of two others. Tap it!
How it works
Find the sum
Each block shows nine numbers. Exactly one of them is the sum of two others. Tap it.
Join them up
Solve every block and the answers join into one more block. Find the sum there too.
Beat your record
The clock starts after the countdown. Every level remembers your fastest time. A wrong tap adds 3 seconds.
7 levels that grow with you
Finish a level fast enough and the next one unlocks.
- Level 0digit + digit
A gentle start with 4 blocks · Next level under 9 s - Level 1digit + 2-digit
Next level under 9 s - Level 22-digit + 2-digit
Next level under 15 s - Level 3digit + 3-digit
Next level under 18 s - Level 42-digit + 3-digit
Next level under 22.5 s - Level 53-digit + 3-digit
Next level under 27 s - Level 64-digit + 4-digit
The final challenge
A look inside
Made for kids, safe for families
- No ads
- No in-app purchases
- No internet needed, play anywhere
- No accounts, no personal data collected
- Works on phones and tablets, in English and Turkish
- Dark mode and a reduced-motion option
Why it helps
Spotting that 38 + 27 = 65 in a blink is a skill that grows with practice. Short rounds and one clear goal, beating your own time, make daily practice feel like play.