There is no such thing as the common factor of a single number. Only two or more numbers can have a common factor.
This is like asking what is common between me and myself. Everything. But you could ask what is common between you and your sister.
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The greatest common factor of the numbers 12 and 42 is 6.
The greatest common factor of 42 depends upon the other numbers with which 42 has COMMON factors. However, the greatest common factor HAS to be one of the factors of 42 which are: 1, 2, 3, 6, 7, 14, 21, 42.
7
Factors of 8 = [1, 2, 4, 8] Factors of 42 = [1, 2, 3, 6, 7, 14, 21, 42] Therefore common factor is 2 since we don't include 1. (Question is supposed to be 'highest' common factor)
The GCF is 6.