Correct spelling, explanation: 72nd is the correct form because the second at the end use the ending nd to show ordinal form of the number. Therefore seventy-second is written as 72nd, not 72th. Th ending is used for ordinal numbers which end with th sound.
Definition of 72nd:
numeral, the ordinal number between 71st and 73rd
My grandpa had his 72nd birthday last week, but he’s living his best life and wants to travel around South America next year.
I wanted to sign up for this lecture, but I don’t think I will get in. I am 72nd on the waiting list.
Incorrect spelling, explanation: this form is incorrect because th is used with ordinal numbers ending with such sound, for example, seventeenth or fifty-ninth. Seventy-second (72nd), however, ends with nd, so this is the suffix for numeral form. Therefore 72nd is correct and 72th is an incorrect form.
Incorrect spelling
Incorrect spelling
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12th is the right one!
12th or 12nd
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