32, 64, 96, 128, 160, 192, 224, 256, 288, 320, 352, . . .
18, 36, 54, 72, 90, 108, 126, 144, 162, 180, 198, . . .
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The multiples of 32 are 32, 64, 96, 128, 164, 196, 224, and so on. The multiples of 40 are 40, 80, 120, 160, 200, 240, 280, 320, 360 and so on. The common multiples of 32 and 40 are 160, 320, 480, 640, 800, and so on.
To find the common multiples of 3, 6, and 18, we need to list out the multiples of each number and find the numbers that appear in all three lists. The multiples of 3 are 3, 6, 9, 12, 15, 18, 21, 24, 27, 30, and so on. The multiples of 6 are 6, 12, 18, 24, 30, and so on. The multiples of 18 are 18, 36, 54, 72, and so on. The first three common multiples of 3, 6, and 18 are 18, 36, and 54.
A multiple of 32 is 32 multiplied by any integer: 0 x 32; 1 x 32; 2 x 32; -1 x 32; etc.
The lowest common multiple is 18. The first four common multiples are thus the first four multiples of 18 and are: 18, 36, 54 and 72.
630 and all the multiples of 630.