How to Play

• Use each of the four numbers exactly once.
• Combine them with +, −, ×, and ÷, and use parentheses to control the order of operations.
• The final result must equal exactly 24.
• In Challenge Mode you solve a series of puzzles; the Custom Calculator finds every solution for four numbers you enter.

Strategy and Tips

• Think in factor pairs of 24: 3 × 8, 4 × 6, 2 × 12, and 1 × 24. Try to turn two numbers into one half of a pair.
• Use subtraction or division to turn awkward numbers into small helpers like 1, 2, or 3.
• Remember that division can create fractions that work out later, such as 8 ÷ (3 − 8 ÷ 3) = 24.
• If one approach fails, go back to the pairs and try combining the numbers in a different order.

Controls

Click or tap the numbers and operators to build your expression. Hints are available if you get stuck, and the Custom Calculator accepts any four numbers.

Background

The 24 Game has been played with ordinary playing cards in China for decades, where it is known as 24 points. A commercial card version was also developed in the United States in the 1980s to make arithmetic practice more fun in schools.