Mr. Marcos & his students at Lincoln Middle School in Santa Monica, CA have the right idea here. Empower the students to teach the world what they have learned about fractions, decimals, exponential notation and algebra. Very impressive. I registered at the site and would love to have some of my students contribute next year. Mathtrain.tv is the address. Here is a promo designed and performed by Mr. Marcos’s sixth grade students.

Student Promo for Mathtrain.tv

Here is my one of my favorite math topics, division by fractions, as taught by “Phillip”, a sixth grader.
Dividing by Fractions