Posted by **Susan** on Wednesday, September 10, 2008 at 8:10pm.

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

- Elementary Math -
**bobpursley**, Wednesday, September 10, 2008 at 8:18pm
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.

- Elementary Math -
**malvin m. macapagal**, Wednesday, October 8, 2008 at 9:22am
hello 99 77 86 88n 687 86 75 44 87 96 95 69 708 87980 79870

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