Find the LCM of Denominators: Calculating LCM(3,4)

To find the least common multiple (LCM) of $3$ and $4$, we list the multiples of each number until we find the smallest multiple they have in common.

Multiples of $3$: $3, 6, 9, 12, 15, \ldots$

Multiples of $4$: $4, 8, 12, 16, 20, \ldots$

The smallest common multiple is $12$.