The Least Common Multiple (LCM) of 12 and 15 is the smallest positive number that is a multiple of both 12 and 15.
Here we will show you two different ways to figure out the Least Common Multiple of 12 and 15.
Our favorite way is to find the prime factors of each number and then merge them together to get the answer.
The prime factor(s) of 12 are:
2 x 2 x 3
The prime factor(s) of 15 are:
3 x 5
Merging them together using the least amount of factors, you get:
2 x 2 x 3 x 5
Then you can multiply those numbers together to get the Least Common Multiple (LCM) of 12 and 15 as follows:
60
To find the Least Common Multiple of 12 and 15, you can also make a list of multiples of 12 and a list
of multiples of 15.
Multiples of 12 would be 12, 24, 36, 48 and so on.
Multiples of 15 would be 15, 30, 45, 60 and so on.
Now, compare the two lists to find the smallest number the two lists have in common, which is the
Least Common Multiple of 12 and 15. You will once again see that the answer will be:
60
What is the Least Common Multiple of 12 and 16?
Go here for the next Least Common Multiple on our list that we calculated.

