1. Calculate by integer multiplication first;

2. See how many decimal places there are in the factor that is decimal, just count a few from the right side of the product and point to the decimal point;

3. If there is a 0 at the end of the decimal part of the product, the 0 at the end of the decimal in the product should be removed according to the nature of the decimal.

When calculating decimal multiplication with integer factor not ending in 0, align the rightmost digit of integer digits that is not 0 with the end of decimal.

If the number of decimal places of the multiplied product is not enough, you should add 0 in front and then add the decimal point. For example, 0.02x2 = 0.04.