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Technically, when writing out a number with words, "and" should only be used to signify a decimal place, for example, "twenty-one and seventy-five hundredths" for 21.75.

This means that for a number without a decimal point, no "and" should be used, and the correct number-word is "two thousand nine." That said, "two thousand and nine" is commonly used in casual spoken language.

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16y ago

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