How many numbers can be rounded to 800 to the nearest hundreds?

Answer 1

800

Answer 2

Infinitely many numbers.

101 whole numbers . Although, technically 800, itself, would not be rounded. This would comprise the numbers from [750, 850]. In the first case the 5 is rounded up while in the second it is rounded down. This is consistent with the rule of "Round up or down so that the new last digit is even". This is the default rounding mode used in IEEE 754 computing functions and operators.

Answer 3

750 to 849