Purple Math
Purplemath: Logarithms: Introduction to "The Relationship"
Purplemath does a wonderful job of explaining logarithms. The lesson begins with a discussion of the relationship between logarithms and exponentials and very simple examples. The lesson gives important information regarding logarithms...
Help Algebra
Help algebra.com: Properties of Logarithms
Three properties of logarithms are presented here (product, quotient, and power properties). Examples are provided to demonstrate how to use the properties to expand and simplify logarithmic expressions.
Interactive Mathematics
Interactive Mathematics: Properties of Logarithms
The properties of logarithms are presented here, along with examples of how to apply to them to situations like population growth.
Interactive Mathematics
Interactive Mathematics: Logarithms to Base 10
Learn how to calculate logarithms (to base 10) and antilogarithms with this simple demonstration.
Purple Math
Purplemath: Basic Log Rules / Explanding Logarithmic Expressions
Purplemath gives both a formal and informal discussion of log rules with exercises. Examples include expanding, simplifying, and evaluating logarithms. Changing the base of a logarithm is also discussed with examples.