Overview:
Two different bar graphs are made from the same survey of favorite foods.
The students need to determine which graph is more fair and why, by studying
the graphs and altering the data.
A collection of math related topics from basic arithmetic to geometry and combinatorics. Presents the concepts in an easy to understand way, also provides applets demonstrating concepts.
The Enigma Project from Cambridge University is a presentation by Dr James Grime about the fascinating history and mathematics of codes and code breaking. From the Greeks and Romans to the modern day, including a demonstration of a genuine World War II Enigma Machine.
The Enigma Machine used by the Nazis in WWII enciphered messages using a series of wires and rotors, and it took mathematicians Marian Rejewski and Alan Turing to decipher this complex coding machine.
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.
A very fun math education blog that includes great resources and many posts about honest elementary school reactions to mathematics and their theories. One thing a teacher has to be is prepared for questions we can't answer!
This is one of the most relevant applications that I have found to present to students. There are TED talks about it, but I like this version for students to approach and play with the animation by writing math equations.
History of mathematics presented through famous problems, with some exercises and their solutions. Done in conjunction with the Math Forum, the home of Ask Dr. Math.