I've included the Shmoop website in previous blogs and the eMagazine, as a provider of free study guides for topics in Social Studies and Language Arts; Shmoop has recently branched-out to include mathematics study guides.

The first a collection of study guides for Pre-Algebra topics. The collection is broken into six categories...

  • basic operations;
  • fractions & decimals;
  • ratios & percentages;
  • basic geometry;
  • basic statistics & probability; and
  • basic Algebra.

Shmoop is also offering a glossary of mathematics terms.

Shmoop's Pre-Algebra guides are designed so that learners can use them on their own as a supplement to their practitioners' instructions. Each subsection of the Shmoop Pre-Algebra provides learners with...

  • visual and text explanations of each topic;and
  • some problems to try on their own; including a "hint" button for learners to use when they get stuck on a tough problem.
Visit http://www.shmoop.com/pre-algebra/ to find out more.