Mammoth Memory

Front end estimating

Front end estimating is rounding the first significant number on any calculation as a rough estimate.

By rounding the first number in a sum you can make it easier but the answer wont be exactly correct 

Sometimes the front end is more important.


Example 1

Estimate the following sum:


Adding `4026+398+42` is tricky.

But adding `4000+400+40` is easy.

`+` `400`
`+` `40`




The real answer is `4466` and so you can see that `4440` is a worthy estimate.


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