80 in 8

Eight minutes of mental math. Can you get 80 right? As many as you can in 480 seconds, each one scored the moment you answer.

How it works

1. Eight minutes on the clock. Type each answer and press Enter: decimals (0.375 or .375) and fractions (3/8) are fine.
2. A right answer scores 10; a wrong one or a skip costs only time. 80 right is a strong score.
3. Problems get harder as you improve, as in Sixty-second math: pace yourself, the last minute counts as much as the first.

It trains mental math stamina. After every round you see the best answer and why.

Play 80 in 8

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 Next in the sequence, or the probability puzzles.