Web Reference: Learn how to use ordinal numbers in English with clear grammar rules, common usage, and examples. Includes a full list from 1st to 100th, ... Nov 6, 2023 · Here is the short answer, in case you are in a rush: '1st' is the correct numeric abbreviation of the ordinal first. '1th' is a grammatical error, and it should never be used. The brief overview will help you if you need to quickly decide which spelling to use, but there is more to learn. Ordinal numbers may be written in English with numerals and letter suffixes: 1st, 2nd or 2d, 3rd or 3d, 4th, 11th, 21st, 101st, 477th, etc., with the suffix acting as an ordinal indicator.
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