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You can round up to 800 or round down to 790. There are good statistical reasons for rounding numbers ending in 5 in such a way that the previous digit is even. This would mean rounding up to 800.
The answer to an addition question should have no more decimal places than the smallest number of decimal places in the numbers being added. When rounding numbers, numbers 5 though 9 will be rounded up and 1 through 4 will be rounded down.
It would be 50. In rounding up, we add one and truncate the digits after the decimal point. In rounding down, we just truncate the digits. http://en.wikipedia.org/wiki/Rounding#Common_method
That depends on how you are rounding: Rounding up = 6.33 Rounding down = 6.32 Rounding nearest = 6.32
if you are rounding up, 64999999.9999999999999...etc if you are rounding down, it depends on how much you are rounding down. the usual answer could be, 69999999.9999999999999...etc