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.
![](/images/user/base/Maths/Logarithms/Reference%20Tables/reference-log-table-1.4df6ee6.jpg)
![](/images/user/base/Maths/Logarithms/Reference%20Tables/reference-log-table-2.d516bb3.jpg)
![](/images/user/base/Maths/Logarithms/Reference%20Tables/reference-anti-log-table-1.b0b0513.jpg)
![](/images/user/base/Maths/Logarithms/Reference%20Tables/reference-anti-log-table-2.f89189d.jpg)