There are many knowledge points in primary school review!

Chapter I Number and Number Operation

A concept

(1) integer

The meaning of 1 integer

Natural numbers and 0 are integers.

2 natural number

When we count objects, 1, 2, 3 ... the numbers used to represent the number of objects are called natural numbers.

There is no object, which is represented by 0. 0 is also a natural number.

3 counting unit

One, ten, one hundred, one thousand, ten thousand, one hundred thousand, one million, ten million, one hundred million ... are all counting units.

The propulsion rate between every two adjacent counting units is 10. This counting method is called decimal counting method.

4 digits

Counting units are arranged in a certain order, and their positions are called numbers.

Divisibility of 5 numbers