The least common multiple of the numbers 72 and 21 is 504.
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The least common multiple of 14 , 72 = 504
lcm(4, 9) = 36 → the two least common multiples (ie the first two common multiples) of 4 and 9 are 36 and 72.
The common multiples of 9 and 16 are 144, 288, 432 and so on.
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.
They are: 24 48 and 72