Question

What is the lcd of 1/3 and 3/7

Help rn​

Answer 1

The least common denominator is 21.

Explanation:

First, you must find the least common factor of the two:

3: 3, 6, 9, 12, 15, 18, 21, 24, 27, 30

7: 7, 14, 21, 28, 35, 42, 49, 56, 63, 70

Second, you must increase the fractions:

`(1)/(3)` ×
`(7)/(7)` =
`(7)/(21)`
`(3)/(7)` ×
`(3)/(3)` =
`(9)/(21)`