Calculating 24 points is generally a mathematical game in which four positive integers are added, subtracted, multiplied and divided to make the final calculation result equal to 24. This game tests students' mathematical sensitivity and reaction ability. Mostly used in classroom teaching or math week contest. It can greatly mobilize the coordination ability of students' eyes, brain, hands and mouth, and is also conducive to cultivating students' mental arithmetic ability.

Next, let me share some skills.

Use the multiplication formulas of 3×8=24, 4×6=24 and 2× 12=24 skillfully, that is, multiply the cards in hand by 3 and 8, 4 and 6, 2 and 12.

For example, when the number of cards is 4, 12, 2, 8, parents can guide their children to use the multiplication "4×6? =? 24 "or" 2× 12=24 ". That is, "4, 12,2,8" can be combined in the following form:12× (8-4-2) =12× 2 = 24 or 4× (12-8+2) =

Addition and subtraction: (25- 1=24, 27-3=24, 28-4=24, 30-6=24)

Try to make up the four numbers on the card face into the minuend and the minuend of the above subtraction.

Use the operational characteristics of 0, 1 1 to solve it.

For example, 3, 4, 4 and 8 can form 3× 8+4-4 = 24. For another example, 4,5, j and k can form11× (5-4)+13 = 24 and so on.