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Estimating is usually quicker and simpler than finding the exact value and a good estimate can often be sufficiently accurate for the purposes.
The estimated answer for 308 would be 300. When estimating, you round the number to the nearest place value you are estimating for. In this case, we are estimating to the nearest hundred, so we look at the hundreds place digit (3) and drop the tens and ones digits. Therefore, the estimated answer for 308 is 300.
Given a true value and the measured value,the error is measured value - true value;the relative error is (measured value - true value)/true value, andthe percentage error is 100*relative error.
51 IS a whole number and so you do not need to do any estimating!
The way I really understand it, is that its estimating by the highest place value, not a very close estimation, but still around the number.