Walks through a very nice example of the chi-squared test using a two way table. Explains degrees of freedom for this case. Also discusses when a t-test can be used.

This applet from MIT allows you to select from 8 examples of differential equations. It allows you to select the step size. As you toggle through, the step size you selected traces out the "solution" in the vector field. You can then change the step size. It demonstrates the value of a small step size and also provides the actual solution.

Short video showing the relative volumes of a square pyramid and a cube with the same dimensions. Allows students to understand the origin of the volume formula for square pyramids.

A nice applet from the National Library of Virtual Manipulates allows students to test their understand of boolean logic using Venn diagrams.

The applet allow you to control a point on the unit circle. As you move the point, the sine function is traced out.

This video describes how to use a slider to dynamically control parabolic functions to see how they transform the parabola.

Video describing how to construct an angle whose measure is dynamically controlled using a "slider."

Geogebra video describing how to construct a line parallel to another line through a point not on the line.

Video describes how to construct a perpendicular line through a point on a line

Video describing how to construct an angle bisector using Geogebra. Useful in teaching students how to make the construction.

Video on how to bisect a line segment. You can use this to teach the class how to do it while you move about the class.

Video on how to use Geogebra for linear optimization. Good for Pre-calculus.

Golden ratio, the "divine proportion" phi, the golden mean spiral.

Assigning numbers to notes allows a musical rendition of pi. Cool!

ViHart Again. She's amazing. She visually shows amazing patterns using Pascal's triangle and shows algebraic patterns with it.

Contains doodling videos, music, etc. Vi Hart is now a full-time musician at Khan Academy.

VERY cool time lapse video of doodling that really shows a base two exponential function.

Mu Alpha Theta is the National High School and Two-Year College Mathematics Honor Society. The link provides access to the top 8 student math videos for 2013.

pdf of a textbook chapter on Linear Diophantine Equations. These are "nice" standard form equations.

Provides a VERY wide range of mathematics vocabulary in an indexed set of topics.