# Front end estimating

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

Sometimes the front end is more important.

Example 1

Estimate the following sum:

4026+398+42

Adding 4026+398+42 is tricky.

But adding 4000+400+40 is easy.

 4000 + 400 + 40 4440

NOTE:

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