AoPS gets the basics covered very well with their pre-Alg book. My DD had Arithmetic with vulgar fractions down already but the AoPS class really reinforced that knowledge and cemented it into a very solid base.
An intuitive 'number sense' and soiid Arithmetic are essential prerequisites to Algebra and the AoPS class really does a good job there.
There are also Beast Academy and Alcumus there too which are free, I think. Why not just get the text and solutions books and see how your child does with them. They have a very engaging style and after a couple of weeks of hand holding my DD learned how to learn from a real Maths textbook and work through the book independently.
Best of luck!
Last edited by madeinuk; 01/06/15 05:09 AM.
