The least common multiple of 12 and 28 is 72.
12:12,24,36,48,60,72
18:18,36,54,72
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The LCM is: 840
The LCM is: 336
LCM of 12 and 21 is 84, which is also a multiple of 28 so 84 is your answer.
the LCM of 12 and 28 is 84
It is 2100