I found a newly released problem book on intermediate and college algebra, with medium and advanced level problems. What it brings new is its structure: it does not only contain the problems and their solutions, but the solver passes through three intermediary stages to the final solution: hints, solving algorithms and proofs, which are separate in the book.
It is listed on Amazon and B&N, but it can be acquired cheaper on publisher's website at www.infarom.com/new_releases.html .
It is titled MATHEMATICS PROBLEMS WITH SEPARATE PROGRESSIVE SOLUTIONS: HINTS, ALGORITHMS, PROOFS. VOLUME 1 - INTERMEDIATE AND COLLEGE ALGEBRA.
Sounds like a great system I wll go and have a look. For my childrens foundation math learning I used math board games and they worked very well.
Derek from http://www.funkidmathgames.com
Have a fantastic day
Derek de Bres from funkidmathgames.com