Find Least Common Multiple of 20, 60 and 180 by listing out the factors.

LCM( 20, 60, 180 ) = 180

Write down multiples of each number until you find the first common multiple:

The multipliers of 20 are: 20, 40, 60, 80, 100, 120, 140, 160, 180, 200, . . .

The multipliers of 60 are: 60, 120, 180, 240, . . .

The multipliers of 180 are: 180, 360, . . .

We can see that:

LCM( 20, 60, 180 ) = 180

This solution can be visualized using a Venn diagram.

The LCM is equal to the product of all the numbers on the diagram.