59 of them. Any 2-digit number, from 41 to 99 (inclusive), rounded to the nearest 80 would lead to 80.
A:
It depends on what you are rounding to. Assuming you are rounding to the nearest tens it would be the following:
75, 76, 77, 78, 79, 80, 81, 82, 83, & 84
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It depends on whether you are rounding to the nearest ten of hundred (or even twenty).
945,000 / 3 = 315,000 so that is the middle number then 1 either side. 314,999 + 315,000 + 315,001 = 945,000
10.43
1549
14,000