24 is a very useful mathematics education tool. It can help you exercise your calculation skills and increase their sensitivity to numerical calculations.

The 24 Game is an arithmetical card game in which the objective is to find a way to manipulate four integers so that the end result is 24. For example, for the card with the numbers 4, 7, 8, 8, a possible solution is (4+7-8)x8=24.

- testing mode
You can time the test.

- searching mode
You can input 4 numbers, and you will get the solutions!

- notebook mode
You can save the questions to your notebook, and then you can retest them.