The Least Common Multiple (LCM) of two or more numbers is the smallest number that is a multiple of each of those numbers. For example, if we take the numbers 4 and 6, the multiples of 4 are 4, 8, 12, 16, ... and the multiples of 6 are 6, 12, 18, .... The smallest number that appears in both lists is 12, so the LCM of 4 and 6 is 12. Finding the LCM is useful in various situations, such as when adding fractions with different denominators. To add 1/4 and 1/6, you need a common denominator, which is the LCM of 4