Can you explain what the difference between rounding and front end estimation is? For example round 8267-2761= and front end estimate 6489-1807= .

Answer 1

Front end estimation generally produces a better estimate of sums or differences than rounding before adding or subtracting.

How to Estimate a difference by front end estimation

* Subtract the digits of the two highest place values
* Insert zeros for the other place values
*
* Example: 7396 minus 3745 is estimated to be 3600 by front end estimation (i.e. 7300-3700).

Now Rounding:
8267-2761
8300-2800
5500

You do the front end estimate.

Answer 2

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