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The popular rule is that when the writer is identifying a particular something-or-other, like an address, the number is used.

If the writer is merely writing about a subject, grass for example, then he'll say that the property needs ten inches of rain a year. The main subject is grass, planting, growth.

If the writer is writing about particular dates and numbers of people, then in keeping with consistency, it's best to use numbers. "During the 1800's, 50,000 people lived a comfortable life in cities that had about 2,000 streets".

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Q: Do you spell out seven or eight or can you use the number 7 or 8 when using in a sentence which one is correct grammar?
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