Law of division: How many digits is the divisor? Look at the first few digits of the divisor first. If the first few digits are not divided enough, look at one more digit. Except for the one to which it belongs, all the vendors will write on it. It is not enough for quotient one and quotient zero to occupy one position. The remainder is less than the divisor. If the quotient is decimal, the decimal point of the quotient should be aligned with that of the dividend. If the divisor is a decimal, it must be divided into integers and then calculated.

By using the changing law of product and the invariant law of quotient, some calculations can be simplified. But pay attention to the remainder in the division with remainder. For example, 8500÷200 can reduce the dividend and divisor by 100 times at the same time, that is, 85÷2, and the quotient remains unchanged, but the remainder 1 reduction 100, so the original remainder should be 100.

Extended data

1, the relationship between dividend, divisor and quotient:

Dividend is enlarged (reduced) by n times, and quotient is correspondingly enlarged (reduced) by n times.

The divisor is expanded (reduced) by n times, and the quotient is correspondingly reduced (expanded) by n times.

2, pen division: first remove according to the law of integer division, the decimal point of quotient should be aligned with the decimal point of dividend; If there is a remainder at the end of the dividend, add "0" after the remainder to continue the division.

3. Division calculation rules with divisor as decimal: first, move the decimal point of divisor to make it an integer, and move the decimal point of divisor to the right by several digits (if there are not enough digits, add "0"), and then calculate according to the division rules with divisor as integer.