LCM( 15, 20, 25 ) = 300
Write down multiples of each number until you find the first common multiple:
The multipliers of 15 are: 15, 30, 45, 60, 75, 90, 105, 120, 135, 150, 165, 180, 195, 210, 225, 240, 255, 270, 285, 300, 315, . . .
The multipliers of 20 are: 20, 40, 60, 80, 100, 120, 140, 160, 180, 200, 220, 240, 260, 280, 300, 320, . . .
The multipliers of 25 are: 25, 50, 75, 100, 125, 150, 175, 200, 225, 250, 275, 300, 325, . . .
We can see that:
LCM( 15, 20, 25 ) = 300
This solution can be visualized using a Venn diagram.
The LCM is equal to the product of all the numbers on the diagram.