1, fractional multiplication

The significance of fractional multiplication is the same as that of integer multiplication, which is a simple operation to find the sum of several identical addends.

2. Calculation rules of fractional multiplication

Fractions are multiplied by integers, and the product of the multiplication of fractions and integers is taken as the numerator, and the denominator remains unchanged; Fractions are multiplied by fractions, the product of numerator multiplication is numerator, and the product of denominator multiplication is denominator. But the numerator denominator cannot be zero.

3. The importance of fractional multiplication

Fractional multiplication of integers, like integer multiplication, is a simple operation to find the sum of several identical addends. Multiplying a number by a fraction can be regarded as finding a fraction of this number.

brief introduction

Fractional addition with denominator. An offer score can be reduced if the denominator is added, the numerator is added, and the denominator remains the same.

Fractional subtraction with denominator. Subtract the same denominator score, subtract the numerator, the denominator remains the same, and the offer score can be reduced.

Fractional addition with different denominators. Fractions with different denominators are added, and then calculated according to the law of adding fractions with the same denominator.

Fractional subtraction with different denominators. For the subtraction of fractions with different denominators, divide the fractions first, and then calculate according to the subtraction rule of fractions with the same denominator.