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I just read the answer and it doesn't help what so ever
Early estimation can help give an indication of the answer.
It can be very helpful, so the question is inappropriate.
yes
It is not always the case. I would not bother to estimate 3+5 before getting the actual answer because (for me) the effort involved is the same.Having said that, with complicated calculations, having an estimate can help decide whether it is likely that your calculation is correct.