How do you find the Least common multiple of 15, 20?
LCM = 60
Let's first find the prime factors of these two numbers:
The LCM will have all the prime factors from the two numbers but we can drop replicates across the numbers we're doing this for. In this example:
From 15, we get both the 3 and the 5
From 20, we get two 2s - the 5 is already accounted for in the 5 from the 15.
The LCM is: