LCM( 5, 7 ) = 35
Write down multiples of each number until you find the first common multiple:
The multipliers of 5 are: 5, 10, 15, 20, 25, 30, 35, 40, . . .
The multipliers of 7 are: 7, 14, 21, 28, 35, 42, . . .
We can see that:
LCM( 5, 7 ) = 35
This solution can be visualized using a Venn diagram.
The LCM is equal to the product of all the numbers on the diagram.