Get better at math and mental arithmetic

Get better at mental math with fun questions. Five minutes a day makes a big difference.

Your 5-minute Session

Solve as many as you can in the time

Free
No ads
No sign-up to play
Play offline

See how it works

Five minutes of play can sharpen everyday math.

Answer quick mental-math questions at your own pace. SumNinja keeps the next question within reach while you build speed and confidence.

Start with five minutesA short Session gives you a clear finish line and still counts toward your streak.
Questions adjust as you playCorrect answers gradually open more challenge. Mistakes bring the difficulty back within reach.
Your progress stays visibleSee streaks, achievements, round history, speed, and accuracy for each player.

Tap a color or type the answer during play.

More ways to play

Play fastBeat the timer Play accurateNo mistakes MultiplayerPlay together on this device More ways to playMore challenges AchievementsYour latest unlocked achievements and a quick way into the full collection.

Keep going, little by little

See what your practice adds up to.

SumNinja keeps each player’s results separate, so progress stays personal even when several people share one device.

Follow your progressReview streaks, achievements, performance, and every saved round. Play on the same deviceAdd players with their own settings and history, or take turns in a local Multiplayer match.

Ready to try five minutes?

Start a short Session now. You can change the time whenever you like.