Sixty-second math

Mental arithmetic against the clock, the way trading firms screen for it. As many as you can in 60 seconds, each one scored the moment you answer.

How it works

1. Type each answer and press Enter. Decimals are fine (0.375 or .375), and so are fractions (3/8).
2. A right answer scores 10. A wrong one or a skip costs only time.
3. Problems get harder as you improve: from two-digit sums to percentages and multi-step sums.

It trains fast, accurate mental math. After every round you see the best answer and why.

Play sixty-second math

Play with friends or a club

Challenge a friend with a duel link, or run a tournament for a club or class: one link, the same rounds for everyone, one run each, and a live leaderboard.

Also try 80 in 8, or the probability puzzles.