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rounding
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rounding

In mathematics, a process by which a number is approximated to the nearest above or below with fewer decimal places. For example, 34.3583 might be rounded to 3 decimal places - 34.358 (the 3 is below 5), whereas 34.3587 would be rounded to 34.359 (the 7 is above 5). Similarly, 3,587 might be rounded to the nearest thousand (or to 1 significant figure), giving 4,000. When unwanted decimals are simply left out, the process is known as truncating.

Rounding can produce considerable errors, especially when the rounded numbers are multiplied by other rounded numbers.

For example:

The volume of a cuboid is calculated as 3 × 4 × 5, each dimension being rounded to 0 decimal places, the true dimensions being 3.4 × 4.4 × 5.4. The rounding error is 20.784 out of 80.784, an error of over 25%, which could be an unacceptable degree of accuracy.



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