1. Draw a text box on white paper.

2. Write "Double Understanding" in the text box.

3. Draw the secondary title on both sides, and then add the related content of "double understanding" to the secondary title.

4. Add a few smaller branches to the branch, and add relevant content, and the mind map about "knowledge of the times" will be done.

Times represents the relationship between two quantities, so "times" is not a unit of measurement. When finding how many times one number is another number, it is to find how many other numbers this number contains, so it is calculated by division. The smallest multiple of a number is itself. There is no maximum multiple, and the number of multiples is infinite.

Among integers, numbers that are multiples of 2 are called even numbers, and numbers that are not multiples of 2 are called odd numbers. 0 is the smallest even number; 1 is the smallest odd number. Time is the relationship between two numbers. If there are several other numbers in a number, it can be said that one number is several times that of another.

Mathematically, multiplication means that several times a certain number equals several times a certain number. An integer can be divisible by another integer, which is a multiple of another integer. For example, 15 can be divisible by 3 or 5, so 15 is a multiple of 3 and 5.

The quotient obtained by dividing one number by another. For example, a÷b=c, that is, A is a multiple of B. For example, A÷B=C, it can be said that A is c times of B, and a number has countless multiples, that is to say, the set of multiples of a number is infinite. Note: you can't call a number a multiple alone, you can only say who is a multiple of who.

In mathematics, doubling means doubling the original number. For example, if the original number is 2, then doubling it means increasing 2, which means it becomes 4, which is exactly twice the original number.

Double effect

1, which is used to solve practical problems: By using the concept of "time", problems in real life can be transformed into mathematical problems, so that we can better understand and solve these problems. For example, when calculating the price, speed and other issues, you can use "times" to compare and calculate the proportional relationship between different objects.

2. Used to compare sizes: Using the concept of "times", we can compare the size relationships of different quantities. For example, if you know that one number is several times that of another, you can easily compare the size relationship between the two numbers.

3. Used to simplify calculation: When calculating complex problems, using the concept of "times" can simplify the calculation process. For example, if a number is required to be multiple times, the result can be obtained directly by multiplication without complicated addition or division.

4. Used to discover laws: In some mathematical problems, we can use the concept of "times" to discover some laws or characteristics. For example, in some series, we can look for the laws or characteristics of the series by observing the proportional relationship between two adjacent items.