LCM( 18, 32, 4 ) = 288
Write down multiples of each number until you find the first common multiple:
The multipliers of 18 are: 18, 36, 54, 72, 90, 108, 126, 144, 162, 180, 198, 216, 234, 252, 270, 288, 306, . . .
The multipliers of 32 are: 32, 64, 96, 128, 160, 192, 224, 256, 288, 320, . . .
The multipliers of 4 are: 4, 8, 12, 16, 20, 24, 28, 32, 36, 40, 44, 48, 52, 56, 60, 64, 68, 72, 76, 80, 84, 88, 92, 96, 100, 104, 108, 112, 116, 120, 124, 128, 132, 136, 140, 144, 148, 152, 156, 160, 164, 168, 172, 176, 180, 184, 188, 192, 196, 200, 204, 208, 212, 216, 220, 224, 228, 232, 236, 240, 244, 248, 252, 256, 260, 264, 268, 272, 276, 280, 284, 288, 292, . . .
We can see that:
LCM( 18, 32, 4 ) = 288
This solution can be visualized using a Venn diagram.
The LCM is equal to the product of all the numbers on the diagram.