13rd
Incorrect spelling, explanation: 13rd is a mistake, because full-word form thirteenth ends with th, so the number form should also have suffix th. Therefore 13th is the correct form. rd is the suffix only for numbers with third at the end, for example twenty-third – 23rd.
13th
Correct spelling, explanation: this is the correct way to write this number down, because full-word form ends with th (thirteenth; 13th). Only numbers ending with rd (so with third) have this suffix, for example 33rd, 963rd etc.). Therefore 13rd is incorrect and 13th is the correct form.
Definition of 13th:
numeral, ordinal number between 12th and 14th
It’s her 13th birthday today, so she is very excited.
The meeting is on April 13th.
13st
Incorrect spelling
13nd
Incorrect spelling
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Correct form is 123rd.
how about 123rd or 123th?
12th is the correct form, not
12nd12 what 12nd does OK
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