Ninety
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The number 90 is written out in words as such: ninety. You should spell out a number rather than write it in number form in particular scenarios, such as if you are beginning a sentence with a number.
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Since 90 is a whole number, rounding 85 to 90 does result in a whole number.
Absolute value of -90 is 90.
(80 + 90) / 2 = 85Therefore, the number between 80 and 90 is 85.