You "round" numbers by deciding if the number is closer to the lower number or to the higher one. Logically, the halfway point would be the point that decides which is which. This means that 75500.5 would be the halfway point between 75500 and 75501. So the greatest possible number that you would round DOWN to 75500 would be 75500.4
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It depends on the degree to which you are rounding. To the nearest integer, the answer would be 75499.5 to the nearest 100, 75450 to the nearest 500, 75250
0.755 hectometers, 0.0755 kilometers, 755 decimeters, 7550 centimeters, and 75500 millimeters