1, the meaning of fractional multiplication.

(1) Fractional multiplication of integers has the same meaning as integer multiplication. Is a simple operation to find the sum of several identical addends.

(2) the score multiplied by the score is to find the score of a number.

2. Calculation rules of fractional multiplication.

(1) Fraction multiplied by integer: the product of numerator multiplied by integer is numerator, and the denominator remains unchanged.

(2) Fraction multiplication: the product of numerator multiplication is the numerator, and the product of denominator multiplication is the denominator.

3. The commutative law, associative law and distributive law of integer multiplication are also applicable to fractional multiplication.

Multiplicative commutative law: a×b=b×d

The law of multiplicative association: a×b×c=a×(b×c)

Multiplication and distribution law: a×(b+c)=ab+ac or a×(b-c)=ab-ac.

4, the significance of fractional division

Fractional division has the same meaning as integer division, which refers to the operation of knowing the product of two factors and one of them and finding the other factor.

The calculation rule of fractional division: dividing by a number that is not 0 is equal to multiplying the reciprocal of this number.

Law (when fractional division is relatively large):

(1) When the divisor is greater than 1, the quotient is less than the dividend;

(2) When the divisor is less than 1 (not equal to 0), the quotient is greater than the dividend;

(3) When the divisor is equal to 1, the quotient is equal to the dividend.