Decimal numbers in calculations often display a spurious degree of accuracy. By removing these unnecessary digits, rounding can simplify mathematical operations without compromising the results.
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That would depend on what you were rounding it to. If rounding to the nearest whole number, then it does not need rounding. If rounding to the nearest ten, it would be 420. If rounding to the nearest hundred, it would be 400.
The depends to what decimal place you are rounding the number.If you are rounding to hundredths, it will be 2.27If you are rounding to tenths, it will be 2.3If you are rounding to the nearest whole number, it will be 2.
What is the effect of rounding the entrance of the mouthpiece?
It depends on what you are rounding to. If rounding to the nearest ten, the 9 at the end decides which way to round it, and being a 9, it rounds up. If rounding to the nearest hundred, it was is the 7. If rounding up to the nearest thousand, it is the 8.
That depends what you are rounding to:If you are rounding to the nearest ones or whole number, you are already there. 5 is the answer.If you are rounding to the nearest tens, the answer would be "10".