The LCM is: 1302
The GCF is: 2
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The GCF and LCM of 24 and 42 are 6 and 168 respectively.
Lcm: 126 gcf: 7
GCF: 7 LCM: 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.
Gcf: 42 lcm: 252