I just sent a text to a friend, who didn't understand an acronym I used for a game: "Ah, I said it in a previous text so thought it was ok to abbreviate it." Though, since it was an acronym I ...
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 ...