42=2x3x7
56=23x7
so the HCF = 2x7 = 14
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The GCF is 14.
Prime factors of 56 are 23 x 7Prime factors of 78 are 2 x 3 x 13The LCM is the product of all the primes to their greatest power,so the LCM of 56 and 78 is 23 x 3 x 7 x 13 = 8 x 273 = 2,184
The Greatest Common Factor (GCF) is: 7
The GCF is 70.
The GCF is 10.