420
14 = 2 x 7
70 = 2 x 5 x 7
84 = 22 x 3 x 7
lcm = 22 x 3 x 5 x 7 = 420
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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 105, 84, 70, 49 the LCM is: 2,940
84 is a multiple of 14 so is itself the LCM
The LCM is 70.
420