# How to find logs in base 10 on a TI-89?

##### 1 Answer

Sep 13, 2014

There are 2 ways.

The math way is to understand how to convert bases:

#log a=(ln a)/(ln 10)#

The second way is to use the "CATALOG" button, "L", scroll down to "log" and press enter.

Here is an example of

#=(ln 50)/ln(10)#

#~~1.69897#