Download 9-6 Finding Common Denominators

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Reteaching
9-6
Finding Common
Denominators
How to find a common denominator.
How to rename fractions to have the
same denominator.
Find a common denominator for
4
d3
10 an s'
Rename
16 and ~ using 40 as the
common denominator.
Multiply the numerator and denominator
by the same nonzero numbers.
List multiples of the denominators
10 and 8.Then look for a common
multiple.
x4
x5
I'~
10: 10, 20, 30,~
1''\
4
10
8: 8,16, 24, 3~
~X4
The number 40 can be used as the
common denominator.
16
40
./
3
15
'8
40
-,
X5./
The renamed fractions are ~~and ~~.
In 1 through 8, find a common denominator for each pair
of fractions.
2
.± and z
· 5
3
d 5
5. "4
an 16
3
1
6• land
9
2
7
3
3• ~and~
4
6
4. "8and 10
1
7. gand
3
8
7
d 4
8• 20
an 15
In 9 through 16, find a common denominator for each pair of
fractions. Then rename each fraction in the pair.
9.
16 and ~
4
d2
13. 16
an "3
10. ~ and ~
l
14•land
6
11. ~ and
t
2
2 an
1'"3
d 3
18
7
d 7
16. 12 an 15
4
.•
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