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21th or 21st – Which Spelling Is Correct? “21st” is the proper spelling and form for the number 21 in its ordinal form. The number 1 is an irregular ordinal number and the correct form is “First”. The suffix “ …

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Learn how to use ordinal numbers in English with clear grammar rules, common usage, and examples. Includes a full list from 1st to 100th, ...

Mar 6, 2026 · The correct form is 21st, not 21th. This rule applies because ordinal numbers in English require specific suffixes based on the last digit of the number. For example, numbers ending in 1 use …

May 21, 2023 · Trying to decide whether '21th' vs. '21st?' Read this guide with a lesson on ordinals to learn why '21st' is correct.

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21st is the ordinal form of the number 21. Twenty-first or 21st may also refer to: A fraction, 1⁄21, equal to one of 21 equal parts 21st of the month, a recurring calendar date 21st birthday, the age of majority …

21th or 21st? 21th Incorrect spelling, explanation: -th is a common suffix for ordinal numbers, however not all of them. Some numbers have irregular suffixes, and 1 is one of them – its ordinal form is first, …