4. How to calculate the points on the following four playing cards to get 24? Please write two prescriptions.

By counting the points on the following four playing cards, there are two ways to get 24:

1. We have four playing cards, each with a number on it. Our task is to make these four numbers get 24 through some basic mathematical operations (addition, subtraction, multiplication and division). It should be noted that each number can only be used once, and the operation order cannot be changed by brackets.

2. Suppose the points on the four cards are A, B, C and D respectively. Our goal is to find a way to make the results of A, B, C and D 24. But considering that we only have four numbers, we can only do limited operations.

3. We can use the following two methods to calculate the points of these four playing cards and get 24. Method 1: 10+ 10+4+0=24. Method 2: (10+ 10)×4+0=80. So the points of these four playing cards can be obtained by the above two methods.

How to use playing cards in math class

1, Know Numbers: Teachers can treat playing cards as digital cards, and let students know the relationship between numbers by comparing the numbers on the cards. Learning scores: Teachers can use playing cards as the carrier of scores, and help students understand the scores by comparing the numbers and colors on the cards. For example, 3 of spades stands for 3/ 16, 4 of diamonds stands for 4/ 16, 5 of hearts stands for 5/ 16 and so on.

2. Probability statistics: Teachers can use playing cards to carry out probability statistics experiments to help students understand the concept of probability statistics. For example, by randomly selecting playing cards to simulate probability events, or counting the frequency of playing cards with different colors and numbers.

3. Geometry: Teachers can make all kinds of geometry through playing cards to help students know and understand the characteristics and properties of geometry. For example, playing cards are used to make geometric figures such as cubes, cuboids and cylinders.

4. Algebraic equation: Teachers can use playing cards as symbols of unknowns to help students understand and solve algebraic equations. For example, put a spade 2 on one side of the equation, indicating that the value of unknown x is 2.