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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