1) Start with the high order of the dividend, first look at how many digits there are in the dividend, and then try to divide the dividend by the first few digits. If it is smaller than the divisor, divide it by one digit as much as possible;

2) Write quotient on divisor and dividend;

3) The remainder after each division operation must be less than the divisor.

Divider is the law of fractional division of integers;

1) According to the law of integer division, the decimal point of quotient should be aligned with the decimal point of dividend;

2) If there is a remainder at the end of the dividend, fill in zeros after the remainder and continue the division.

Integer multiplication algorithm for extended data;

(1) number alignment. Starting from the right, multiply the first factor by the number on each bit of the second factor, and the end of the number will be aligned with which bit of the second factor.

(2) Then add up the numbers multiplied several times.

(Multiply with 0 at the end of an integer: you can multiply the number before 0 first, then see how many zeros are at the end of each factor, and add a few zeros at the end of the multiplied number. )