Find Least Common Multiple of 10 and 18 by listing out the factors.

LCM( 10, 18 ) = 90

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

The multipliers of 10 are: 10, 20, 30, 40, 50, 60, 70, 80, 90, 100, . . .

The multipliers of 18 are: 18, 36, 54, 72, 90, 108, . . .

We can see that:

LCM( 10, 18 ) = 90

This solution can be visualized using a Venn diagram.

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