As the name implies, we need to list the multiples and to find the least one that is common to all the numbers.

For example, to get the LCM of 3, 6 and 9:

The multiples of 3 are 3, 6, 9, 12, 15, 18, 21 ...

The multiples of 6 are 6, 12, 18, 24, ...

The multiples of 9 are 9, 18, 27, ...

Look for the least multiple that is common to all three numbers - thus 18 is the LCM of 3, 6 and 9.

Shortcut To Finding LCM
Here is a useful shortcut to finding the LCM of a set of numbers. For example, to find the LCM of 3, 6 and 9, we divide them by any factor of the numbers in the following manner:

The following video highlights the difference between greatest common factor and least common multiple.

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