# 7.4 Dividing Fractions

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Published on May 14, 2008

Author: mrwilliams

Source: slideshare.net

## Description

http://mrwilliams.edublogs.org

7.4 Dividing Fractions Mr. Williams GESD jwilliams@gesd40.org Objective: Use reciprocals to divide fractions in  class and on a worksheet. 1

Vocabulary 5 3 Reciprocal ­ two numbers, whose product is one. (Such as         and          ) 3 5  3 12 12 What is the reciprocal of           ?  3 2

Warm Up ­ Answer these in your math notes. 1 1 1 5 2 + 8 4 x 6  1 2 3 1 + 6 4 x 2 12 3

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         4 ÷ = x 3          4            3         3 All you do is quot;switchquot; the  second fraction then multiply. 4

Solve these problems in your math notes. 5         4 5         3 ÷ = x 8         3 8         4  7           1  7           2 ÷ = x 10          1 10          2 5

Write a fraction divison problem in your math notes. We will share some of them on the board. 6

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. 7

So what does all that mean? 3 Divide 6 by 4 3 6 3 6 4 6 ÷ = = x 4 1 ÷ 4 1 3 8

Solve these problems in your math notes.  9 10 ÷ 3 = 2 12 ÷ 3 = Finish this sentence: You divide fractions by ... 9

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