It is: 210
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The lowest common multiple (LCM) of 42 and 70 is 210.
The LCM is 70.
The LCM is 42.
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.
Least Common Multiple (LCM) for 7 14 42 is 42.