Question

What is the least common denominator of 3/20 and 8/15?
A.30
B.20
C.5
D.60

Answer 1

5 since both numbers are divisible by 5 and not by any smaller number

Answer 2

The least common denominator is 5.
This is because all of the other numbers are not divisible by the denominators; they are either greater than one of them or not divisible.