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21st century astronomy the solar system fourth

Dev Ctc Edu Publishers

5 min read · May 08, 2026

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“21st” is the correct form to indicate the ordinal number between 20th and 22nd. “21th” is an irregular ordinal number, because it ends with 1. The number one, as an ordinal number, is “First” – and the …

6 Mar 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 …

21 May 2023 · If you are in a hurry, I have a quick answer for you. Here it is: '21th' is a grammatical error. '21st' is the correct numeric abbreviation of twenty-first. If you have time to stick around, this …

16 May 2022 · Some numbers have irregular suffixes, and 1 is one of them – its ordinal form is first, so the suffix in the numeral form will be -st. 21th is, then, a mistake and the correct form is 21st. Correct …

1 Mar 2024 · But as you sit down to finalize the invitation, you find yourself scratching your head, questioning whether it should say “21th” or “21st”. Well, the correct way to write it is “21st”. Ordinal …

24 Mar 2024 · 21th is incorrect. The proper ordinal representation for twenty-one is 21st, denoting a position after the 20th.

21st is the ordinal form of the number 21. Twenty-first or 21st may also refer to:

9 Apr 2024 · Learn the correct usage of "21st" and "21th" in English. Discover differences, examples, alternatives and tips for choosing the right phrase.

We need a hyphen when we write cardinal numbers from 21 upwards. Notice there's no space between the letters and hyphen: Using a hyphen also applies to ordinal numbers from 21st. twenty-first = 21st …