128 (128 times 4 gives 512)
The GCF of 128 and 512 is 128.
128
512 + 128 = 640.
The GCF of 57 and 512 is 1.
The GCF is 128.
384
128 x 4 = 512
GCF(343, 512) = 1; the numbers are coprime.
512/4 = 128
The GCF is 1.
Ah, the greatest common factor of 128 and 256 is 128. You see, the greatest common factor is the largest number that divides evenly into both numbers, and in this case, 128 is the biggest number that fits that description. Just imagine those numbers as happy little friends, sharing their common factor joyfully.
The GCF is 16.