1 and 2 are factors common to both numbers
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The only common factor of 64 & 29 is 1.
Common factors of 12 & 64 are 1, 2 and 4.
Factors of 64... 1,2,4,8,16,32,64 Factors of 66... 1,2,3,6,11,22,33,66 Common factors to both numbers.... 1 & 2.
43 is a prime number so the common factors of 43 and 42 are 1
The factors of 64 are all 2s and the factors of 81 are all 3s. The greatest common factor is 1, since they have no factors in common. ■