36, 72, 108, 144, 180, 216, 252, 288, 324, 360, 396, 432, 468, 504, 540, 576, 612, 648, 684, 720, 756, 792, 828, 864, 900, 936, 972 . . .
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The least common multiple is 72. So take the number 72 and go through it's multiples. They will all be common multiples of 24 and 36.
all the multiples of 36 (because 6 goes into 36 w/o remainder) 36, 72, 108, 144, etc.
They're all multiples of 1, 2, 3 and 6.
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.
36 and 72