LCM( 10, 15 ) = 30
Write down multiples of each number until you find the first common multiple:
The multipliers of 10 are: 10, 20, 30, 40, . . .
The multipliers of 15 are: 15, 30, 45, . . .
We can see that:
LCM( 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.