1,100 videos on YouTube covering everything from basic arithmetic to chemistry, biology, calculus and economics. 8 million video views and growing. 70,000 students a month watching 35,000 videos a day. Over 2 million minutes of instruction delivered world-wide in the past week. Self-paced teaching software and assessment. The most used, most exhaustive, and richest instruction on the Internet. Mission of providing a world-class education to anyone, anywhere, for free.

"GraphCalc is an all-in-one solution to everything from everyday arithmetic to statistical analysis, from betas to Booleans, from cubes to calculus, from decimals to derivatives. GraphCalc combines all the features of a professional mathematics package with the simplicity of an easy to learn windows interface. It provides user-friendly help and tutorials to guide you through the easy and fun process of mastering GraphCalc. GraphCalc is ready to use out of the box. Don't bother reading the documentation. Just start the program and you'll see how easy it is to use."

Free downloadable software

Video tutorial explaining how to create the quadratic formula into a Word document

131 activites that include challenge problems, puzzles, fun with calculators, etc. These are from the NCTM content.

This model uses circular orbits to approximate the paths of Mars and Earth. It uses 3:2 as the ratio of their orbital radii (the actual is about 1.524:1), and it uses a ratio of 2:1 as the ratio of the time it takes them to complete one revolution about the sun (the actual is about 1.881:1). It also assumes that the orbits of both planets are circular with the Sun as the center, although this is not the case; in actuality, the orbits are ellipses, and the Sun is one of the foci. However, these approximations are close to the actual data, and they allow for the development of a polar equation (5 ‑ 4cosθ) that produces a perfect limaçon. A representation that uses a better approximation of the actual data will not result in such a nice curve.

Illuminations has 104 online activities available. Select which types of activities you're looking for, and click Search to search by K-2, 3-5, 6-8 or 9112

What children can learn about art and geometry.

Greg Lynn talks about the mathematical roots of architecture -- and how calculus and digital tools allow modern designers to move beyond the traditional building forms. A glorious church in Queens (and a titanium tea set) illustrate his theory.

CompassLearning provides special reports, news stories and other resources for suggestions on using technology to improve math instruction, ensure proficiency and elevate students' chance for success in today's competitive global workplace.

fun, yet challenging, lessons and activities in high school mathematics and computer programming for students and teachers. Includes tutorials for TI 83+, 84+ and TI-Nspire graphing calculators

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