Inactive Tutor answered 07/24/16
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Note: estimates don't have to be easier than exact answers. For example, what is the estimated value of 2+2+2 ?
Now, estimating the value of 1.9 + 2.1 + 2.1 is slightly easier than finding the exact answer. And estimating 2.01232345 +1.980045 + 1.999999 makes estimating important.