Numbers (e.g., 1st): Dates, e.g., March 1st, Ranking things (e.g., 1st, 2nd, or 3rd prize), Centuries (e.g., 21st century), Building floors (3rd floor), Fractions (e.g., 1/3), Edmonton addresses (e.g., 10110-24th St.), Spelled-out numbers (e.g., first): Ranking things (e.g., first, second, or third prize), Centuries (e.g., twenty-first century), Steps in a process (e.g., first, take an egg, second, break it into a bowl, etc.), Building floors (third floor), Fractions (e.g., one-third), Roman numerals (e.g., III): Names of kings and queens, e.g., Charles III.,

How do I write ordinal numbers?

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