Find Least Common Multiple of 40, 80 and 120 by listing out the factors.

LCM( 40, 80, 120 ) = 240

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

The multipliers of 40 are: 40, 80, 120, 160, 200, 240, 280, . . .

The multipliers of 80 are: 80, 160, 240, 320, . . .

The multipliers of 120 are: 120, 240, 360, . . .

We can see that:

LCM( 40, 80, 120 ) = 240

This solution can be visualized using a Venn diagram.

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