Most decimals comprise an infinite number of digits: some are repeating and other non-terminating. If you did not round them, most people would still be writing out their first decimal number - and they would still be at it when they died!
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Two decimals that can be rounded to 4.09 are 4.085 and 4.086. When rounding to the nearest hundredth, both of these decimals round up to 4.09.
There are 99 of them - using the IEEE standard of rounding half to even
it rounds to that number because the number 4 is lower so they take that number out of the picture.
It gets rid of unnecessary clutter and so allows you to focus on what is important.
Yes you do that is very important when doing a decimal problem.* * * * *It is important for other basic binary operations but NOTmultiplication.