NUMBERNUT.COM is a great site to explore. They have basic, advanced and prealgebra sections on their sites that cover everything you might be interested in. Here is how they describe their site:
Thanks for visiting! Right now you're on NUMBERNUT.COM. If you are looking for math information, stay on this site. You can start by choosing one of the math topics we cover.
We now have three sections on the site:
Shapes & Colors, Numbers & Counting, Addition, Subtraction, Multiplication, and Division.
Number Types, Fractions, Decimals, Percentages, Estimation & Rounding, Ratios, Money, and Factors.
Graphing, Roots and Exponents, Units, Advanced Numbers, Scientific Notation, and Variables.
This site offers an introduction to mathematics and its variety of topics. It's not just for kids, it's for everyone (even if you aren't a number nut). If you're still not sure what to click, try our site map that will show you all of the topics we cover. If you surf the site and get lost in all of the information, use the search function on the side of the pages.
Grab a cup of tea and sit back and enjoy cruising this great site. Let us know what you think of this math site.