# Properties of Logarithms

1.   $\rhd$ Introduction to Logarithm Properties (1 of 2) (9:16)  Logarithm identities for addition and subtraction of logarithms.
2.   $\rhd$ Introduction to Logarithm Properties (2 of 2) (10:04) Multiplication of a logarithm by a constant and the change of base formula.
3.   $\rhd$ Using the properties of Logarithms (multiple steps) (2:09)  Sal simplifies $\log_5 \frac{25^x}{y}$
4. $\rhd$  Evaluating logarithms: change of base rule (7:32) Sal approximates $\log_5 100$ to the nearest thousandth using the change of base formula.