Is 11 a greatest common factor?

Answer 1

It sure can be. You never know what the greatest common factor is until you know

the two numbers that it's a factor of .

11 is always the greatest common factor of any two numbers that look like this:

=> 11 and (any multiple of 11)

=> 22 and (any odd multiple of 11)

Answer 2

It can be. 11 is the GCF of 22 and 33.