LCM( 3, 6, 9 ) = 18
Write down multiples of each number until you find the first common multiple:
The multipliers of 3 are: 3, 6, 9, 12, 15, 18, 21, . . .
The multipliers of 6 are: 6, 12, 18, 24, . . .
The multipliers of 9 are: 9, 18, 27, . . .
We can see that:
LCM( 3, 6, 9 ) = 18
This solution can be visualized using a Venn diagram.
The LCM is equal to the product of all the numbers on the diagram.