LCM( 12, 28 ) = 84
Write down multiples of each number until you find the first common multiple:
The multipliers of 12 are: 12, 24, 36, 48, 60, 72, 84, 96, . . .
The multipliers of 28 are: 28, 56, 84, 112, . . .
We can see that:
LCM( 12, 28 ) = 84
This solution can be visualized using a Venn diagram.
The LCM is equal to the product of all the numbers on the diagram.