To find an approximate value of a calculation is to Estimation
Sometimes it is not necessary to get an exact answer to a question. If you only need a rough idea of what the answer is, then you can approximate it. This can be especially helpful when you are working with large or complex numbers. Approximate values can be easier to understand and use than exact values, especially when you are dealing with decimals.
So, The accuracy of an approximation depends on the number of decimal places or significant digits that you use. The more digits you use, the more accurate the approximation will be. However, the more digits you use, the more time it will take to do the approximation.
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To find an approximate value of a calculation is to -----