7.4 dividing fractions
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7.4 Dividing Fractions
Objective: Use reciprocals to divide fractions in class and on a worksheet.
Mr. WilliamsGESD
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Vocabulary
Reciprocal two numbers, whose product is one. (Such as and )53
35
What is the reciprocal of ? 312 12
3
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Warm Up Answer these in your math notes.
12
18+
112
26+
14
56x
34
12x
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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.
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5 48 3
7 110 2
5 38 4
7 210 1
÷
÷
=
=
x
x
Solve these problems in your math notes.
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Write a fraction divison problem in your math notes.We will share some of them on the board.
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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.
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So what does all that mean?
Divide 6 by34
6 ÷ 34 = 6
1 ÷ 34
61
43= x
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Solve these problems in your math notes.
910 3
1223
÷
÷
=
=
Finish this sentence:You divide fractions by ...