I just read the answer and it doesn't help what so ever
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Early estimation can help give an indication of the answer.
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.
Ex: 52.73 x 384.12 Round to 50 x 400 = 20,000 so when you do the actual math you know that there are 5 places to the left of the decimal.
Estimate: 45,000 Actual: 46,505
Estimate: 70 percent of 50 (I lowered the percent, so I rounded the number up. My way of estimating) which is 35. Actual: 32 3/25