Multiply them together.
Chat with our AI personalities
The least common multiple of the numbers 72 and 21 is 504.
The common factors are 1 and 7. (7 = 1 x 7 and 21 = 3 x 7) The only common prime factor is 7, which is also the largest common factor.
Since this is a single number, you could say that it shares all of its multiples with itself. So the least multiple of the number is itself. However, determining a least common multiple generally requires at least two numbers from which to find the LCM.
You need at least two numbers to find an LCM.Multiples of 7 include 14, 21 and 28.
The only Least Common Multiple (LCM) for 7 9 14 is 126.