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The Final Report of the National Mathematics Advisory Panel noted that many middle school students have a weak understanding of mathematical equality and that this lack of understanding impedes their learning of algebra.

This website has easily organized math topics presented by multiple speakers in English and Spanish.

What is it how does it work and how to set it up

"In this section, you will find some fun ways to learn about math. You can start out with Estimation of Length, Place Value and Weight and Capacity. If you want something more challenging, take a look at Line Symmetry, Patterns and Tangrams."

Welcome to Math Playground, an action-packed site for elementary and middle school students. Practice your math skills, play a logic game and have some fun!

What an awesome idea. Would be a great motivator for learning. 

created a fully functional, browser-based  graphing calculator. The calculator performs all of the functions you would expect to see in a graphing calculator with a couple of extras that you don't find in typical graphing calculators. Desmos allows you to share your equations and graphs through a Bit.ly link. Desmos graphs your equations as you type them and redraws them as you alter your equations.

Some investigations and projects and lessonplans here

GeoGebra: Do the Math is a series of screencast tutorials for teachers and/or students. The tutorials were initiated as a project to support Maine math teachers in the integration of technology in the classroom. What is GeoGebra provides an overview of the program and its capabilities. Several tutorials present the program's menu options and tools in step-by-step format. Another group of tutorials provides examples of GeoGebra learning activities in major math content areas. These tutorials are intended as a visual supplement to printed guides and documentation. GeoGebra users can find a wealth of guidance and examples at www.geogebra.org. A web search such as "GeoGebra Pythagorean Theorem" will yield hundreds of additional articles, examples, and applets.

"Below are 10 good Chrome extensions to use in your math classes. These are are meant to help kids develop math skills through a wide variety of exercises, activities, games, interactive simulations and many more. Some of these apps are integrated with Google Drive and are also available for  iPad, Android, and Chromebooks."