2. multiplication and addition. Given the unit 1 and the number of fractions more than the unit 1, multiply the specific number of the unit 1 by the sum of the unit 1 and the fractions more than the unit 1.

3. Multiplication and subtraction. Given the number of units "1" and a few fractions smaller than the unit "1", multiply the specific number of units "1" by the difference between the unit "1" and the few fractions smaller.

4. organization. What fraction of the known unit "1"? Find the unit "1" and divide the specific number of the unit "1" by its corresponding score.

5. Division and addition. Given the number of fractions more than the unit "1", find the unit "1" and divide the number of fractions more than the unit "1" by the sum of the number of fractions more than the unit "1".

6. Division and subtraction. What is the number that is a few fractions smaller than the unit "1"? Find the unit "1", and divide the number that is several fractions smaller than the unit "1" by the difference between the unit "1" and the unit "1".

In short, if the number of the unit "1" is known, find another number related to the unit "1" and multiply it; If you know the fraction of the unit "1", find the unit "1" and work it out by division.

Extended data:

1. Fractional division algorithm

Law of fractional division: Fraction A divided by Fraction B is the reciprocal of Fraction A multiplied by Fraction B.

The meaning of fractional division is the same as that of integer division, that is, the product of two factors is known, and one factor is used to find the other factor. Dividend numerator multiplied by divisor denominator, dividend denominator multiplied by divisor numerator.

Fractional division application problem: first find the unit 1. Known unit 1. Multiplication is used to find partial quantity or corresponding fraction, and division is used to find unit 1.

Second, the decimal multiplication algorithm

1, when a fraction is multiplied by an integer, the product of the numerator of the fraction multiplied by the integer is taken as the numerator, and the denominator remains unchanged. Make an appointment if you can.

2, the score multiplied by the score. Use the product of molecular multiplication as the numerator and the product of denominator multiplication as the denominator. Cut if you can.

Baidu encyclopedia-fractional multiplication

Baidu Encyclopedia-Fractional Division