The common multiples of 18 and 72 are 72, 144, 216, 288, 360, 432, 504, 576, 648, 720, and so on. Anything divisible by 72 is divisible by 18 since 18 is one of the factors of 72.
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12, 24, 36, 49, 60, 72, 84 28, 56, 84
36= 2x2x3x3 96= 2x2x2x2x2x3 2x2x2x3= 24, 48, 72
72, 84 and 96
The multiples of 12 are infinite, beginning with these: 12, 24, 36, 48, 60, 72, 84, 96 +12 . . .
lcm(4, 9) = 36 → the two least common multiples (ie the first two common multiples) of 4 and 9 are 36 and 72.