2.8 Using reciprocals to divide fractions

​DIVISION FRACTION PROPERTY

​A rule for dividing that says division by a fraction is the same as multiplication by the reciprocal of the fraction. Another name for this property is the "invert and multiply rule" for example

​Both are correct.

When you multiply by 1/2 , you take 1 of 2 equal groups. You do the same thing when you divide by 2. You get an answer of 10 in both.

​10 ÷ 3

​

​

​ 10/3 or 3 1/3 gallons

​10 ÷ 11

​10/11 gallons

​10 * 1/4

10 * 1/11

​3

​8/15

2

​I can change 3 3/8 to 27/8 and multiply by 4/5, the reciprocal of 5/4.

​16/30 or 8/15

12/4 or 3

​6/12 or 1/2

​1/2

​12/6 or 2

​3/4 ÷ 1/8

​6 batches

​2/3 * 5/6

​3/7 * 2/3

​3/4 * 8

​12/15

​6/21

​80,81,82

​

​HOMEWORK> HL 2.8