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In speaking, always use ordinal numbers for dates, streets, and floors of a building.
His birthday is on January twentieth.
OR
It's on January 20th.
Her apartment is on Seventy-seventh Street.
OR
It's on 77th Street.
Use ordinal numbers for numbering things in a sequence.The full form is used in numbering.
Her first class is English. Her second is math. Her third class is history.
Use numbers or quantifiers in answers to questions with how many.
A: How many parks are there?
B: Three.
OR
A few.
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