Rounding off will result is a small error. If there are many subsequent calculations using a rounded off number, these errors could accumulate.
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It is better to use independent notation.
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.
when rounding you want to choose an answer with the lowest significant figures to have a better answer choice
You can write this as a 6, followed by 25 zeroes. But since it is such a big number, better leave it in scientific notation, i.e., leave it as 6 x 1025.You can write this as a 6, followed by 25 zeroes. But since it is such a big number, better leave it in scientific notation, i.e., leave it as 6 x 1025.You can write this as a 6, followed by 25 zeroes. But since it is such a big number, better leave it in scientific notation, i.e., leave it as 6 x 1025.You can write this as a 6, followed by 25 zeroes. But since it is such a big number, better leave it in scientific notation, i.e., leave it as 6 x 1025.
When talking about the number of miles to other stars, it is best to use scientific notation. Example: 2.38 x 1014 looks better than 238000000000000.