What is the greatest common factor of 8 and 22?

This is one of those rare, outstanding questions that manages to encapsulate two

separate, fundamental errors into only eight Words.

1). Although fractions do have factors, you're never asked to find "common factors" of fractions.

2). Even if you were, the 'C' in 'GCF' stands for the Word "common", and that Word means

"same for both". So there's no way you can ever find anything 'common' about one

single thing. It takes at least two things before they can have anything 'in common'.

And if you're working with common factors, you need at least two different numbers

before there can possibly be any.