7.4 dividing fractions

9

Click here to load reader

Upload: mrwilliams

Post on 13-May-2015

2.020 views

Category:

Education


2 download

DESCRIPTION

http://mrwilliams.edublogs.org

TRANSCRIPT

Page 1: 7.4 Dividing Fractions

1

7.4 Dividing Fractions

Objective: Use reciprocals to divide fractions in class and on a worksheet.

Mr. WilliamsGESD

[email protected]

Page 2: 7.4 Dividing Fractions

2

Vocabulary

Reciprocal ­ two numbers, whose product is one. (Such as         and          )53

35

What is the reciprocal of           ? 312 12

 3

Page 3: 7.4 Dividing Fractions

3

Warm Up ­ Answer these in your math notes.

12

18+

 112

26+

14

56x

34

12x

Page 4: 7.4 Dividing Fractions

4

Dividing Fractions is easy. It is just like multiplying fractions with one more step.

To divide a fraction, multiply by its reciprocal.

2          3            2         43          4            3         3÷ = x

All you do is "switch" the second fraction then multiply.

Page 5: 7.4 Dividing Fractions

5

5         48         3

 7           110          2

5         38         4

 7           210          1

÷

÷

=

=

x

x

Solve these problems in your math notes.

Page 6: 7.4 Dividing Fractions

6

Write a fraction divison problem in your math notes.We will share some of them on the board.

Page 7: 7.4 Dividing Fractions

7

Dividing Fractions and Whole Numbers

1. Change the whole number into a fraction.

2. Find the reciprocal of your second fraction.

3. Multiply the fractions.

Page 8: 7.4 Dividing Fractions

8

So what does all that mean?

Divide 6 by34

6 ÷ 34 = 6

1 ÷ 34

61

43= x

Page 9: 7.4 Dividing Fractions

9

Solve these problems in your math notes.

 910 3

1223

÷

÷

=

=

Finish this sentence:You divide fractions by ...