Get better at math
practice on the go

Get better at math practice on the go

Get faster and more accurate than your friends. Five minutes a day makes a huge difference.

About SumNinja

SumNinja is a mental math game. In Speed mode, each question has its own timer. Answer in time and the round continues. In Accuracy mode, time is tracked, but the first mistake ends the round.

How to play

Choose how you want to play, answer the math questions, and try to beat your own best score. SumNinja saves progress for each player.

1. Look at the question in the middle of the screen.
2. Type the answer and press Enter. In Speed, each question has its own timer. In Accuracy, the first wrong digit ends the round.
3. After each round, SumNinja updates your stats and chooses questions that fit your level.