Scroll down to just below the middle of the lesson for an in-depth lesson on converting fractions to percents. Works through numerous examples step by step and shows what happens when the "decimal expansion" doesn't end when converting.

Explanations and examples of composing functions with functions.

Explains how to construct a simple box-and-whisker plot, and demonstrates the steps. Discusses quartiles and medians, shows how to find them, and explains how they relate to box-and-whisker plots.

Demonstrates how to evaluate trigonometric functions by using trig identities.

Lists the basic trigonometric identities, and specifies the set of trig identities to keep track of, as being the most useful ones for calculus.

Explains the basic terminology and formatting of ratios, and demonstrates how to solve typical exercises.

Demonstrates how to translate, set up, and solve basic right-triangle word problems.

Explains how to round to a given number of "significant digits".

Introduces techniques for solving trigonometric equations. Provides worked examples of solving some simpler to medium-hard equations.

Explains how to create a stem-and-leaf plot from a data set. Demonstrates how to format a clear stem-and-leaf plot.

Relates the unit circle to the method for finding trig ratios in any of the four quadrants. Demonstrates how the unit circle might be useful.

Introduces the basic terminology of Venn diagrams, and shows how to "populate" and read Venn diagrams.