I. Numbers

In a number, the position of each digit is counted from the right: the first digit is unit, the second digit is ten, the third digit is hundred, the fourth digit is thousand, the fifth digit is ten thousand, and so on.

The same number, placed in different positions, represents different numerical values.

For example, 3 means that there are 3 in one bit1; In ten, it means three tens; Take the hundred as the unit, which means three hundred; It means 300 million.

Second, quantity.

The number of digits of a natural number is called the number of digits. The number of digits of a natural number is called the number of digits. One-digit number is a digit, two-digit number is a digit, three-digit number is a digit ... N-digit number is n-digit.

Extended data

The rules of decimal reading are as follows:

1 and numbers within four digits can be read from the most significant bit in sequence. For example, 1987 can be read as 1987.

2. For numbers with more than four digits, first grade them by four digits from right to left, and then read out the numbers in each level and their horizontal names in turn from the advanced level.

No matter how many zeros there are at the end of a number, you can't read them. After classification, there is a zero at the end of any level, otherwise it will not be seen. When you need to read them, you can only read one zero, no matter how many zeros are in the middle or how many zeros are in succession, when you need to read them, you can only read one zero.