GCF: 7
LCM: 210
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LCM(42, 70, 105) = 210
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 105, 84, 70, 49 the LCM is: 2,940
The LCM is: 210210
LCM = 70 GCF = 7