If logarithms seem like Greek to you, this interactive algebra 2 lesson will help you sort things out. We can use many bases for a logarithm, but the bases most typically used are the bases of the common logarithm and the natural logarithm. The common logarithm has base 10, and is represented on the calculator as log(x). The natural logarithm has base e, a famous irrational number, and is represented on the calculator by ln(x). The natural and common logarithm can be found throughout Algebra and Calculus.

### What Are Natural and Common Logarithms?

This video is courtesy of Bill White (YouTube)

### Citation styles

- APA style
- What Are Natural and Common Logarithms?. (2013, March 2). In
*ClassBrain Math Tutorials*. Retrieved 15:22, March 25, 2017, from http://www.classbrainmath.com/natural-and-common-logarithms/ - MLA style
- Cynthia Kirkeby, “What Are Natural and Common Logarithms?.”
*ClassBrain Math Tutorials*. 2 March 2013, 11:02 UTC. . 25 Mar 2017 <http://www.classbrainmath.com/natural-and-common-logarithms/>. - MHRA style
- Cynthia Kirkeby, 'What Are Natural and Common Logarithms?',
*ClassBrain Math Tutorials*, 2 March 2013, 11:02 UTC, <http://www.classbrainmath.com/natural-and-common-logarithms/> [accessed 25 March 2017] - The Chicago Manual of Style
- Cynthia Kirkeby, “What Are Natural and Common Logarithms?.”
*ClassBrain Math Tutorials*, http://www.classbrainmath.com/natural-and-common-logarithms/ [accessed March 25, 2017]. - CBE/CSE style
- Cynthia Kirkeby, What Are Natural and Common Logarithms? [Internet]. ClassBrain Math Tutorials; 2013 March 2, 11:02 UTC [cited 2017 Mar 25]. Available from: http://www.classbrainmath.com/natural-and-common-logarithms/.
- Bluebook style
- What Are Natural and Common Logarithms?, http://www.classbrainmath.com/natural-and-common-logarithms/ (last visited Mar. 25, 2017).
- AMA style
- Cynthia Kirkeby, What Are Natural and Common Logarithms?. ClassBrain Math Tutorials. March 2, 2013, 11:02 UTC. Available at: http://www.classbrainmath.com/natural-and-common-logarithms/. Accessed March 25, 2017.