Correct spelling, explanation: this is the correct form of this ordinal number because the word form is twenty-third. The ending of the word form of an ordinal number is always the ending of its numeral form. Therefore twenty-third is 23rd (not 23th), sixty-seventh is 67th, etc. This shows why 23rd is the correct form.
Definition of 23rd:
numeral, the ordinal number between 22nd and 24th
He was 23rd in the national competition of speed reading.
It was the 23rd anniversary of our school funding yesterday. We had a nice celebration with the teachers and parents.
Incorrect spelling, explanation: 23th is incorrect because th is not the ending of the word from twenty-third. Although rd is, so 23rd is correct. This is a general rule for all ordinal numbers (for example first is 1st, sixth is 6th). This is why 23rd is the correct form.
Incorrect spelling
Incorrect spelling
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I continue making this error over and over again! Totally messed up.
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