Find Least Common Multiple of 5, 10 and 15 by listing out the factors.

LCM( 5, 10, 15 ) = 30

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

The multipliers of 5 are: 5, 10, 15, 20, 25, 30, 35, . . .

The multipliers of 10 are: 10, 20, 30, 40, . . .

The multipliers of 15 are: 15, 30, 45, . . .

We can see that:

LCM( 5, 10, 15 ) = 30

This solution can be visualized using a Venn diagram.

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