A division with an insufficient number after the average is a division with a remainder. Division with remainder means that one integer is divided by another integer that is not 0, and there is a remainder after getting the quotient of the integer. This division is called division with remainder.

Meaning: When some items are divided equally, each share gets the same amount, but there is still a surplus, and the surplus is not enough. This division is called division with remainder, and the rest is remainder.

Note: The unit name of the remainder is the same as the dividend.

Writing format: 20 ÷ 6 = 3...2, pronounced as: 20 divided by 6 equals 3 greater than 2.

The remainder is less than the divisor, and the dividend = quotient × divisor+remainder. So 20 = 3× 6+2.

There are two ways to solve the division problem with remainder:

"one to one method" (according to the actual situation, after removing the remainder, the merchant should add 1 to the desired answer) and "tail out method" (according to the actual situation, after removing the remainder, the merchant is the desired answer).

When solving the periodic problem, we can get the answer according to the cyclic division formula of "several groups" and remainder.