128 (128 times 4 gives 512)
The GCF of 128 and 512 is 128.
128
512 + 128 = 640.
384
The GCF of 57 and 512 is 1.
The GCF is 128.
128 x 4 = 512
GCF(343, 512) = 1; the numbers are coprime.
512/4 = 128
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 best estimate is the true value.512 = 2^9 = 2^7*2^2 = 128*4Then 512*25 = (128*4)*25 = 128*(4*25) = 128*100 = 12800.
The GCF is 1.