LCM( 8, 16, 20 ) = 80
Write down multiples of each number until you find the first common multiple:
The multipliers of 8 are: 8, 16, 24, 32, 40, 48, 56, 64, 72, 80, 88, . . .
The multipliers of 16 are: 16, 32, 48, 64, 80, 96, . . .
The multipliers of 20 are: 20, 40, 60, 80, 100, . . .
We can see that:
LCM( 8, 16, 20 ) = 80
This solution can be visualized using a Venn diagram.
The LCM is equal to the product of all the numbers on the diagram.