Practice

Drills

• Mental math

  Addition, subtraction, multiplication, division, decimals, fractions and percentages, at three levels.

  2-minute sprint Test: 80 in 8 minutes

• Sequences

  Find the next number. Eight rule types, each sequence checked so exactly one answer fits.

  Warm up: 10 easy 5 minutes, hard

• Probability

  Dice, cards, coins, urns, conditional probability, expected value and combinatorics, with a worked solution for every question.

  Expected value Hard questions

• Daily challenge

  Ten mixed questions, new every day at midnight (Amsterdam). Keep a streak and share your score.

• Ranked

  One timed run per drill per day, scored by our server. Your best run of the week goes on the leaderboard.

  This week's leaderboard