Description: This least common multiple example gives us 3 numbers from which to find the lcm. This is a challenge, but fun. Do it with us! Created by Sal Khan and Monterey Institute for Technology and Education. What is the least common multiple, abbreviated as LCM, of 15, 6, and 10? It's the least common multiple of these numbers. So to do that, let's just think about the different multiples of the 15, 6, and 10 and then find at the smallest multiple, the least multiple, they have in common.*Teacher Advisor is 100% free.