The least common multiple of two numbers
can help you find the the least common denominator of two fractions.
For example:
Multiples of 4 are: 4, 8, 12, 16, 20
Multiples of 5 are: 5, 10 15, 20,
25
The least common multiple of 4 and 5 is 20.
Therefore the least common denominatorof
1/4 and 3/5 is 20.
Complete the following. Fill in themultiples.
Then name the least common denominator of each pair of fractions.
1/2 - 2,
,
6, , ,
, ,
16, 18
2/3 - 3, 6, ,
, ,
,
21
The least common denominator of 1/2 and 2/3 is .
5/6 - 6, ,
, ,
30, 36, 42, 48, ,
7/10 - 10, ,
, ,
,
60
The least common denominator of 5/6 and 7/10 is .
3/4 - 4, 8, ,
, ,
,
28
1/5 - 5, ,
, ,
25, ,
The least common denominator of 3/4 and 1/5 is .
1/5 - ,
,
15, 20, , ,
1/2 - ,
4, 6, , ,
The least common denominator of 1/5 and 1/2 is .
1/4 - 4, ,
,
16, 20
5/12 - 12, 24,
The least common denominator of 1/4 and 5/12 is .
3/8 - ,
,
24, 32, ,
7/10 - 10, ,
, ,
The least common denominator of 3/8 and 7/10 is .
1/8 - 8, 16, ,
, ,
48, 54
5/6 - ,
12, 18, , ,
, ,
The least common denominator of 1/8 and 5/6 is .
2/5 - 5, 10, ,
, ,
, ,
,
3/4 - ,
8, , 16, 20,
The least common denominator of 2/5 and 3/4 is .
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