7'2 Multiplying Fractions

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7.2 Multiplying Fractions
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Multiplying 2 Fractions
Use the same rule as multiplying a fraction times
a whole number where you must have both fractions
in a over b form.
a b
Lets do some examples!
1. Multiply straight across.
2 3 5 8
6
3 20
x

2. Simplify, if necessary.
40
1 2 3 7
2

x

21
3
Lets Do More Examples!
3 1 7 4
3
2 4 3 9
8
x
x
28
27
Ask yourself What can go into both top and a
bottom number?
2
1 8 12 15
8
2
1 8 12 15
2
x

x
180
45
45
3
You may also cross reduce if you choose. Heres
how..
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Even More Examples!
1
2
3 5 8 9
5
6 2 7 3
4
x
x
24
7
3
1
1
1
1
2
5 8 16 15
1
2 1 5 4
10 11
2 22
1 11
x
x
x


6
3
2
2
1
You may also cross reduce the 2s here if you
choose.
5
Now You Try!
2
1 4 3 7
4
1 8 4 15
2
x
x
21
15
1
3
1
2
1
1
5 24 8 25
3
5 3 8 10
2
16 21
1 7
x
x
x

5
14
5
1
1
2
7