Rounding a numerical value means replacing it by another value that is approximately equal but has a shorter, simpler, or more explicit representation.
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by rounding off the numbers
The answer will depend on the degree of rounding. To the nearest ten, it is 39120 To the nearest million, it is 0.
the purpose of rounding numbers is that you can get closer to the actual answer
rounding whole numbers and decimals
There is no universal "better". Rounding off is a trade-off between reducing the accuracy and simplifying calculations. Also, if there are other numbers in an addition that are rounded to the nearest hundred, there is no point in rounding your number to the nearest ten.