<PRE><B>Question 248445</B>
 340+ 680=1020
Estimating by Front End Estimation

    Front end estimation mostly produces a closer estimate of sums or differences than the answer produced by adding or subtracting rounded numbers.

    How to estimate a sum by front end estimation:

        * Add the digits of the two highest place values
        * Insert zeros for the other place values


        * Example 1: 4496 + 3745 is estimated to be 8100 by front end estimation (i.e. 4400 + 3700).
        * Example 2: 4496 + 745 is estimated to be 5100 by front end estimation (i.e. 4400 + 700). 

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