1, fractional multiplication by integer has the same meaning as integer multiplication. Is a simple operation to find the sum of several identical addends.

2. A number multiplied by a fraction can be regarded as finding a fraction of this number.

3. The calculation rule of fractional multiplication by integer: fractional multiplication by integer, the product of fractional numerator multiplied by integer is numerator, and the denominator remains unchanged. Note: When multiplying with a fraction, the fraction should be converted into a false fraction before calculation.

4. Calculation rules of fractional multiplication: fractional multiplication, the product of molecular multiplication is numerator, and the product of denominator multiplication is denominator.

5. In order to simplify the calculation, the points that can be reduced are reduced first and then calculated. Note: When multiplying with a fraction, the fraction should be converted into a false fraction before calculation.

6. Calculation method of fractional multiplication: divide points first, that is, divide the numbers that can meet the denominator in all molecules first, then multiply the numerator by the numerator, and multiply the denominator by the denominator as the denominator of the product.

7. Rule: (When the multiplication is large) A number (except 0) is multiplied by a number greater than 1, and the product is greater than this number. A number (except 0) multiplied by a number (except 0) is less than 1, and the product is less than this number. A number (except 0) is multiplied by 1, and the product is equal to this number.