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. Addition, subtraction, multiplication, or division, and sometimes other operations, may be used to make four digits from one to nine equal 24. For example, card with the numbers 4,7,8,8, a possible solution is the following: 1*2*3*4=24.

The game has been played in Shanghai since the 1960s, using ordinary playing cards...