What is LCM

Lowest or Least Common Multiple

What is the LCM of 7 and 3

List the multiples of each number:

7, 14, 21, 28, 35

3, 6, 9, 12, 15, 18, 21, 24

Find the lowest number that appears in both lists.

LCM of 7 and 3 = 21

LCM is the lowest common multiple shared by two numbers. For example the lowest common multiple of 7 and 3 is 21.

LCM stands for least common multiple. It is the smallest common factor between two or more numbers. So the smallest number is divisible by all the original numbers is said to be the LCM of those numbers.

The LCM stands for Lowest Common Multiple, this means that the LCM is the smallest number in which two numbers can be a multiple of. For example:

The common multiple of 6 and 10 is 60, however when we look at the multiples of both numbers, we see that 30 is the LOWEST common multiple.