For example, the Illuminations website run by the NCTM and the NASA website have a list of Math activities and lesson plans per grade band. The GeoGebra website can be used both in the classroom and by individual students.
Have a look at the SHODOR.org website, a National Resource for Computational Science Education. They maintain a great website, under Activities and Lessons you will find ‘Interactivate’, showing students over 100 math concepts in a novel interactive way.
The great advantage of websites for individual use is differentiation. Many programs provide drills for arithmetic, and there is a growing number of websites that present concepts for white boards in a novel way that is not possible with text books alone.
The first six are free).
The Number Race and it’s follow up the Number Catcher was developed for ages 4 – 8 by Dr. AJ Wilson in collaboration with Dr. S Dehaene from the Unicog Institute (INSERM) in Paris and it is available for free from SourceForge in several languages. It uses recent research in neuroscience to specifically target youngsters with dyscalculia.
The London Knowledge Lab developed the Number-Sense website, with five highly acclaimed activities for students with dyscalculia: Learn Time, Numberbonds, Dots2Track, Numberline, and Chicks Test. You will also find the contact to the Low Numeracy Network and can sign up for regular updates and new information on the topic (using Adobe ShockWave Player).
The Khan Academy has super clear lessons presented on a ‘blackboard’ with oral explanations in all levels, from simple addition to multivariate calculus. There is a built-in progression, that takes students on a journey through the areas of Math and a progress monitoring system. Teachers can connect with their students using the Coach function. Unlike many educational computer programs that span only elementary, middle school or high school level, this one spans many levels, so the student on the verge of one of these school borders does not need to wait till graduation day…
The Connected Mathematics Project for Middle School at the University of Michigan offers a lot of information, not only math content for students, but also a section with in depth explanations for parents, who like to help their teenagers and interactive resources, including online math games using Java: Connected Math
A brand-new website for Middle and High School is SchoolYourself.org It offers great oral explanations and visuals. Students are asked to participate in various points during the explanations and hints are provided to go to videos where you can brush up the required basic knowledge. Virtual Nerd is another new website that has great tutorials for middle and high school www.virtualnerd.com