It is not in the least helpful because the number is already given to the nearest thousands. So estimating 17 472 000 to the nearest thousands to get the answer 17 472 000 seems totally and utterly pointless.
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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.
Your sum might be less than fifty and you would rather round to forty than zero.
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It might have helped to have some idea as to what "these" formulas" were.
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