Incorrect spelling, explanation:
3th is incorrect because third (3rd) doesn’t end with -th but with -rd so such suffix must be added to the number when creating an ordinal form of it. -th is used with numbers ending with it, for example eleventh (11th), fifty-fifth (55th), etc. The correct form is thus 3rd.
Correct spelling, explanation: the correct form of this ordinal number is 3rd because suffixes of ordinal numbers are the same as the ending sound of the word form; therefore third is 3rd, not
3th. This mistake may be caused by the fact that th is the most common suffix in ordinal numbers. There are however three irregular ones: -st, -nd, and -rd.
Definition of 3rd:
numeral, ordinal number between 2nd and 4th
I got 3rd place but I was still very proud of myself.
It’s 3rd time this week you’re late!
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