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Easy

Fifty in 5

Practice Optiver's 80 in 8 with a shortened 50 in 5 - fifty math problems in five minutes. Test your mental math skills, and see where you rank relative to your competition. How sharp are you really?

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How to play
  1. 1.Answer 50 math questions within a 5-minute time limit.
  2. 2.Questions are grouped by difficulty: Cooked, Easy, Medium, Hard, and Cracked.
  3. 3.Click Skip to move a question to the back of the queue.
  4. 4.Scoring: +1 for correct, -1 for wrong, 0 for skipped. Your total score cannot go below 0.
  5. 5.Click Finish or let the timer run out to submit. Unanswered questions count as skipped.