Starting from the last bit, that is, a single bit, it is divided into two-bit groups, leaving one or two bits in front.

The first division is divided according to the division rules, and one point is divided by two digits. If there is one digit left, it shall be calculated as one digit, and the remaining two digits shall be calculated as two digits, leaving a remainder.

In the second division, the divisor is the quotient of 20 times+the quotient to be added, and the dividend is the remainder and the two digits pulled down, and the two digits are pulled down every time.

5 and so on, two digits divided by one. Except for the first time, according to the division rule, the divisor 20 is multiplied by the quotient+the quotient to be added until it is divisible, otherwise it cannot be divisible, and the padding is also two zeros.