Classicsmom,

This is terrific! We've been on Singapore Math on and off. Think it's on again for the next few months. And given that my son suddenly loves online math instruction, this will be just right.

Here's a free site that his teacher at school requires him to use for math acceleration in class:
http://www.mathplayground.com/

It's fabulous - the math games section is heavy on pre-algebra and algebra concepts. This is my son's favourite site now.

Enjoy!