2 years and (a) half vs 2 and (a) half years

These are OK:

two years and a half
two and a half years

"Two years and a half" is NOT ok. Honestly.

'Honestly' is not a good argument, Anon. How about registering as a member and telling us a bit about yourself?

I agree with Anon, two years and a half ago is not gramatically correct. When you say two years (and a half ago) it sounds like that half does not have to do with (years), I mean two years and a (half), a half of what?). Other wise by saying two and a half years ago is more acurate since both, two and a half, are mentioned before saying (years). Two and a half years ago is the proper way to s

Thanks for taking time and explaining that point So I guess If I want to recap it: it is better to mention the number before mentio

Usually, yes. You will notice, however, that the original problem was with the indefinite article.

Thanks Mister Micawber
3L

Anonymoustwo years and a half ago is not gramatically correct.

But "ago" was not part of the original question! I would agree that "two years and a half ago" is incorrect, but in some contexts "two years and a half" would be fine. ("Two years and a half had passed since he left home.")

AnonymousI agree with Anon

You know, it's hard to keep track of an argument between various Anonymouses (Anonymice?). That's one reason we encourage people to register.

Great answer because you offer an explanation. Thanks for the help! Kim V.