Su teaches printing plate sixth grade first volume unit 3 fractional division notes.
First, the significance of fractional division
Fractional division is the inverse operation of fractional multiplication, which is to find the unknown quantity when the ratio of two quantities is known. For example, given that the ratio of a number to 3/4 is 7/8, it can be solved by fractional division.
Second, the calculation method of fractional division
Fractional division is calculated by dividing by a number (except 0), which is equal to multiplying by the reciprocal of this number. That is to say, a÷(b)=a×( 1/b), where b≠0.
For example: 3/4 ÷ 5 = 3/4 × 1/5 = 3/20.
Third, the application of fractional division
Fractional division can be applied to many problems in life. For example, in engineering, technology, commerce and other fields, it is often necessary to calculate the ratio of two quantities and adjust or allocate resources according to this ratio. In business, merchants need to calculate the ratio of the quantity of goods in stock to the sales volume to determine whether they need to purchase goods or adjust their sales strategies. In engineering, engineers need to calculate the ratio of two quantities in order to determine the priority and resource allocation of each engineering link.
Fourth, matters needing attention
When calculating the fractional division, it is necessary to ensure that the denominator of the fraction cannot be 0, otherwise it will be divided by 0, which is meaningless.
When applying fractional division, we should pay attention to the conversion of units. For example, in business, the units of sales volume and inventory may be different, and appropriate conversion is needed for comparative analysis.
When solving practical problems, we should carefully examine the questions, understand the meaning of the questions, and choose the appropriate calculation method according to the actual situation.