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Excel maintains 15 figures in its numbers, but they are not always accurate; mathematically, the bottom line should be the same as the top line, in 'fp-math' the step '1 + 1/9000' leads to a rounding up as the first bit of the 14 bit tail '10111000110010' of the mantissa falling off the table when adding 1 is a '1', this up-rounding is not undone when subtracting the 1 again, since there is no ...
Round-by-chop: The base-expansion of is truncated after the ()-th digit. This rounding rule is biased because it always moves the result toward zero. Round-to-nearest: () is set to the nearest floating-point number to . When there is a tie, the floating-point number whose last stored digit is even (also, the last digit, in binary form, is equal ...
Rounding to a specified power is very different from rounding to a specified multiple; for example, it is common in computing to need to round a number to a whole power of 2. The steps, in general, to round a positive number x to a power of some positive number b other than 1, are:
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Given real numbers x and y, integers m and n and the set of integers, floor and ceiling may be defined by the equations ⌊ ⌋ = {}, ⌈ ⌉ = {}. Since there is exactly one integer in a half-open interval of length one, for any real number x, there are unique integers m and n satisfying the equation
Thus when we are trying to round our numbers up or down, we cannot use rules based on simple greater-than, less-than, or at some exact decimal fraction value, because, in general, these decimal fraction values have no exact representation in binary fraction numbers. JohnHD7 22:08, 28 June 2008 (UTC)
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The highest averages, divisor, or divide-and-round methods [1] are a family of apportionment algorithms that aim to fairly divide a legislature between several groups, such as political parties or states. [1] [2] More generally, divisor methods can be used to round shares of a total, e.g. percentage points (which must add up to 100). [2]