Khan Academy: Arithmetic and Pre Algebra: Inverse Property of Addition

This video shows the inverse property of multiplication and its relation to division. Practice problems are available. [3:16]

This video provides several examples of using the distributive properties of multiplication and division to rewrite expressions. Practice problems are available. [5:39]

This video explains the identity property of multiplication. Practice problems are available. [1:24]

This video explains the identity property of multiplication. Practice problems are included. [1:24]

This video explains the associative law of addition by writing an expression in a different way. Practice problems are available. [2:10]

The instructor demonstrates that when you add the opposite value of a given number to that number you will always get zero. Then she shows how multiplying by the inverse of any number except zero will equal 1.

This video explains the identity property of zero by substituting values into an expression. Practice problems are available. [4:46]

A video explaining the meaning of exponents and exponential notation. Practice problems are available. [9:46]

This video introduces and explains the concept of ratios through a number of examples. Practice problems are available. [14:13]

This video shows how to plot fractions, negative numbers, decimals, and fractions on a number line. Practice problems are available. [1:58]