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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:

$log a = \frac{ln a}{ln 10}$ $log a=(ln a)/(ln 10)$

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

Here is an example of $log 50$ $log 50$ :

$= \frac{ln 50}{ln (10)}$ $=(ln 50)/ln(10)$
$\approx 1.69897$ $~~1.69897$

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