Incorrect spelling, explanation: this form is a mistake, because fourth in 24th ends with th so we should use such ending. rd is used with numbers ending with third, so for example 23rd. This shows that
24rd is an incorrect form, and the correct one is 24th.
Correct spelling, explanation: 24th is the correct form because suffix th is added to numbers which full-word form ends with th. Since twenty-fourth ends with th, 24th is the correct form. For the same reason
24rd is incorrect. Suffix rd is used with numbers ending with rd, therefore for number including third (for example 33rd or 563rd).
Definition of 24th:
numeral, ordinal number between 23rd and 25th
My favourite music shop is on the corner of St. Joseph’s and 24th Street. I highly recommend it.
Mrs Jenkins is 94 years old and Timmy is her 24th grandchild!
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