What does an integer mean?

Integer is a mathematical term, which is a set of positive integers, zero integers and negative integers.

Integers include natural numbers. In fact, the number of integers is infinite, so there is no minimum integer and no maximum integer. For example, 1, 2, 3, 43, 55, 60, 7, 80, 97, 18, 12, 13, 24, 35, 76, 17.

Judgement of separability:

1, divisible by 3

Judgment method: the sum of each number is a multiple of 3.

Example: If 7725, the sum of all digits is 2 1, and 2 1 is a multiple of 3, then 7725 can be divisible by 3.

2. Divide by 9

Judgment method: the sum of all digits is a multiple of 9.

Example: If 6084, the sum of all digits is 18, and 18 is a multiple of 9, then 6084 can be divisible by 9.

3, divisible by 5

Judgment method: The last digit is 0 or 5.

Example: 35, 105,1750,2680 can all be divisible by 5.

4, divisible by 8

Judgment method: The last three digits are multiples of 8.

Example: If 9872,872 ÷ 8 =109, then 9872 can be divisible by 8.

5, divisible by 6

Judgment method: Divided by 2 and 3 at the same time.

For example, 162, 2334, 3576 can all be divisible by 6.

In addition, divisibility has two important properties: transitivity and additivity. It is usually used to establish the relationship between option data and the known conditions of the stem, so as to judge the separability of option data.