The answer will depend on the degree of rounding.
To the nearest ten, it is 39120
To the nearest million, it is 0.
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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.
You can not add irrational numbers. You can round off irrational numbers and then add them but in the process of rounding off the numbers, you make them rational. Then the sum becomes rational.
You can round off to any values such as the nearest odd number or the nearest tens or hundreds etc.
by rounding off the numbers
The rounded off number of 1.875 depends on the level of precision required. If rounding to the nearest whole number, the rounded off number of 1.875 is 2. If rounding to the nearest tenth, the rounded off number is 1.9.