Find least common denominator for fraction?

Answer 1

Find the LCM of the denominators.

Example 1: 1/4 + 2/3

The LCM of 3 and 4 is 12, so the common denominator is 12. Convert each fraction to 12ths and add.

Example 2: 1/8 + 5/6

The LCM of 6 and 8 is 24, so the common denominator is 24. Convert each fraction to 24ths and add.

Answer 2

Example: 1/30 and 1/42

Factor them.

2 x 3 x 5 = 30

2 x 3 x 7 = 42

Select the highest amount of each factor.

2 x 3 x 5 x 7 = 210, the LCD