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Use your own words to explain how to calculate decimals when multiplied by decimals.

Calculation method of multiplying decimals by decimals:

(1) First expand the decimal into an integer.

(2) Calculate the product according to the rules of integer multiplication.

(3) Look at how many decimals there are in the factor, and count the number of decimal points from the right side of the product. If the multiplied product does not have enough decimal places, add 0 in front and add a decimal point.

Note: In the calculation results, the 0 at the end of the decimal part should be removed to simplify the decimal; when there are not enough digits in the decimal part, 0 should be used as a placeholder.

Extended information

Notes on vertical format of decimal multiplication

1. When arranging vertical format, the mantissas of the factors must be aligned.

2. When arranging vertical expressions, factors with many digits are generally placed at the top for the convenience of calculation.

3. If there are factors of tens, hundreds, or thousands, align the first non-zero number from the right of the two factors, and then fill in the corresponding number of 0s in the resulting number. .

4. If there is a 0 at the end of the number, click the decimal point first and then remove the 0.

5. If there are not enough decimal places, you need to add 0 in front.