Submitted by RPoliticsModsFU t3_11ejntv in LifeProTips
"Less" is a more adaptable word, making the correct usage less obvious to untrained ears. But "fewer" has a more precise wording requirement that its misuse is more recognizable.
I have less money than he does.
She has fewer dollars than me.
But the inverse is more dramatically wrong for "fewer" than it is for "less."
I have fewer money than he does.
She has less dollars than me.
"Less is still wrong, but it is less wrong than "fewer."
This is how I learned to pinpoint the context for when to apply which word.
(Edit) I know how the rule works. The point was to have a different way of thinking about it. There are no instances where the usage of "fewer" is ambiguous. It is either correct or blatantly incorrect.
slarti54 t1_jaef4e3 wrote
That wasn't a great way to explain it. Fewer is mainly used with countable nouns.