Incorrect spelling, explanation: this is an incorrect form since number three in its ordinal form is third so we use suffix -rd at the end of the numeral form. Therefore ordinal form of 43 is 43rd (forty-third), not 43th (because third ends with -rd).
Correct spelling, explanation: for ordinal numbers in numeral form we use suffixes which are at the end of written form: forty-ninth is 49th, twenty-first is 21st etc. Usually ordinal numbers end with -th suffix, however not all of them, including third (from ordinal number three), which uses the suffix -rd. That is why 43rd is the correct form and not 43th.
Definition of 43rd:
numeral, ordinal number between 42nd and 44th
For my husband’s 43rd birthday we went to Barcelona.
Tomorrow is my grandparent’s 43rd wedding anniversary.
Incorrect spelling
Incorrect spelling
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