what is the least common denominator of 3/5+1/3

Multiples of 5 are: 5, 10, 15, 20, 25, 30

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

What is the smallest number that is a multiple of both 5 and 3?