If used well, it can give a quick answer which may be sufficiently accurate for the purpose.
Suppose I have 24 dollars and I want to buy 5 books which cost 4.97 each. I estimate 5 books@5 dollars = 25 dollars. No, I have not got enough money. I do not need to know the exact amount I would have needed to determine that I have not got enough.
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When a quick approximate answer will suffice.
give me examples of estimate
If an estimation, or estimate, is a guess, an approximate estimation is a rougher guess.
Estimation is a quick of working out roughly what the answer is