
A round-off error, also called rounding error, is the difference between the calculated approximation of a number and its exact mathematical value. Numerical analysis specifically tries to estimate this error when using approximation equations and/or algorithms, especially when using finitely many digits to represent real numbers (which in theory ...
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http://en.wikipedia.org/wiki/Round-off_error

The error accumulated during a calculation due to rounding intermediate results. Related entry • banker's rounding
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http://www.daviddarling.info/encyclopedia/R/round-off_error.html

The error accumulated during a calculation due to rounding intermediate results.
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https://www.encyclo.co.uk/local/20687
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