# How do you use a calculator to evaluate the expression log0.8 to four decimal places?

Nov 2, 2017

Press the keys, enter, then round it to four (see explanation below)

You should get -0.0969

#### Explanation:

1) Find a scientific or graphics calculator & turn it on
2) press the $\log$ button (it's usually at the top section in the middle somewhere)
3) type in 0.8 (maybe with brackets around it)
4) press $=$ or 'exe' (bottom right corner usually)

Your calculator should now show -0.096910013

This is not to four decimal places!

To round to four, count 4 spaces after the decimal point. This is the 9: $- 0.096 \textcolor{red}{9} 10013$

Get rid of everything after it. (the digits are below 5 so you round down).