The GCF is 9.
The GCF is: 27
The GCF is 81.
The GCF is 1.
The GCF is 1.
The GCF is 1.
The GCF is 2.
3 255 = 3 x 5 x 17 243 = 35 gcf = 3
1
9
The GCF of 243, 256, and 343 is 1. 243 = 3^5 256 = 2^8 So the first two have a GCF of 1. Adding 343 = 7^3 to the list cannot increase the GCF so it must remain 1.
The GCF is 27.