Lessons are fully captioned, signed in American Sign Language, and voiced.
Maths section of the Revision World site which gives revision aids geared towards the GCSE and A level examines in England.
Very easy to read and understand.
allows students to input their maths questions and receive instructions and feedback on what the correct answer is for that problem. The questions can range from geometry, to fractions, to even complex numbers. This site is geared towards an older age group however. Young students may not find it easy to use. Secondary school students should be able to navigate through this site nicely however. Also, Web Math has a feature that, upon signing up, can give you specific answers and tutorials for questions in a textbook. This is a homework help tool powered by Discovery Channel. Be aware that you must enter questions in the correct format. If doing trigonometry questions use sin(x) not sin x.
Very powerful knowledge base for all kinds of numerical data. This amazing site accepts questions in free-form and covers from the simple to very complex.
This site provides e-books that can be down loaded as PDFs. The topics are not confined to maths. But it does involve signing up to a weekly email update about what is available.