1, first quadrature according to the law of integer multiplication;

2. See how many decimal places the multiplicand and multiplier * * * have, and count the decimal places from the right side of the product.

3. If there is a 0 after the decimal point, cross out the 0 after the decimal point according to the basic properties of the decimal point.

Extended data:

Vertical calculation rule

1, multiplication

The i-th bit of one number is multiplied by the j-th bit of another number.

It should be added to i+j- 1 bit of the product.

Step 2 separate

For example, 42 divided by 7.

On a scale of 4 [from high to low]. When calculating the division vertically, start from most significant bit, such as: 42 from most significant bit 4; If you can't divide, for example, 4 can't be divided by 7.

Then use the highest bit and the next bit to synthesize a number to divide until the divisor can be divided; For example, if 4 is not divisible by 7 in 42, then 4 and 2 are combined into a number. If 42 is divided by 7, the quotient is 6.

Baidu Encyclopedia-Vertical