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As a product of its prime factors: 2*3*3*5 = 90
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.
The number 15/90 is not in its simplified form. The number 15/90 in it simplified form is 1/6.