It is: 1
The GCF is 77.
The GCF is 33.
The GCF is 21.
The GCF of 242, 231 is 11.
The GCF of 180 and 231 is 3.
The GCF of 60 and 231 is 3
The GCF is 40.
The GCF is 40.
GCF of 154 and 231 = 77 -Red Mist
The GCF is 21.
The GCF is: 21
Since 20 is a factor of 320, it is automatically the GCF.