The general method of multiplying decimals by decimals in knowledge points;

1, first calculate by integer multiplication.

2. See how many decimals one of the two factors has. Just count the decimal places from the right of the product and point to the decimal point.

3. If the number of product digits is insufficient, make up with 0; If there is a 0 at the end of the decimal part, you should point to the decimal point first, and then remove the 0 after the decimal point from the product according to the nature of the decimal.

learning target

1, know the arithmetic of decimal multiplication.

2. Master the calculation rules of fractional multiplication, and know that when determining the number of digits of the product, if the number of digits is not enough, you should add 0 in front.

3. Correctly calculate decimal multiplication and improve the calculation ability.

4. Understand the relationship between products and elements.

5. Cultivate the ability of migration and analogy, and get a preliminary understanding of transformation ideas in mathematics.