84 is a multiple of 14 so is itself the LCM
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If that's really 4270 and 84, the GCF is 14 and the LCM is 25620. If that's 42, 70 and 84, the GCF is 14 and the LCM is 420.
For the values: 21, 14 the LCM is: 42
84
14
The Least Common Multiple (LCM) of 12, 14, and 3 is 84.