Take the 2-minute tour ×  I know in more formal writing,
spelling out fractions is preferred (e.g. two-thirds), and in
math no suffix is used, but I frequently see ordinal suffixes
being used on fractions (e.g. 2/3rds), even from reputable news
sources.  2/3 is already pronounced two-thirds and, to me, the
addition of rds just looks weird and is certainly unnecessary.
Google turns up millions of examples:   Even legit news sources:
Wikipedia has nothing to say about it:   Is this proper English
or just an undefined grey area?  share|improve this question I'd
guess that it's used to make 2/3 read as a word, especially in
headlines. Technically, it should be "2 3rds" –  JeffSahol May
16 '12 at 3:00 add comment  2 Answers  up vote 2 down vote
accepted  The very first link from OP's Google search is
Wikipedia's page on the "game" Guess 2/3 of the average. This
doesn't actually include the characters 3rd at all, which is
what I'd expect.  Google tries to interpret search terms in the
most helpful way, but in th