Problems needing attention in vertical multiplication calculation;

The last digit of two numbers should be aligned.

Try to write as many numbers as possible on it, and write as few numbers on it to reduce the number of multiplications.

Extended data:

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.

The law of fractional division in which divisor is decimal;

1) First look at how many decimal places the divisor has, and then move the decimal point of the divisor to the right by a few places. If there are not enough decimal places, use zero to make up;

2) Then divide by the fractional division of integer divisor.