Practice mental math for a minute
Sixty seconds, rising difficulty, integer answers — a warm-up for interviews or a brain break.
Tools used in this guide
The job
Mental arithmetic fades without use. A short timed sprint — addition and subtraction first, multiplication and division joining as your streak builds — is the classic drill.
Sixty-second run
Press start and answer as many as you can before the clock ends. Division problems are constructed backward so every answer is a clean integer; a wrong answer resets the difficulty streak.
Worked example
Five in a row unlocks ×; twelve unlocks ÷ and negatives. A solid run solves 12–18 problems — interview warm-ups target the steady tier-1 range.
Where it stops
One-minute runs only, no leaderboards and no stored history — the score on screen is the whole record. Input is keyboard-friendly but there's no voice or touch pad mode.