Thanks for the notice about the new books, and thanks for the interesting comments in this thread. Several of the comments mention the issue of "problems" versus "exercises," and I should mention a FAQ about that point,
http://www.epsiloncamp.org/ProblemsversusExercises.php which I first prepared for my local mathematics classes (I use the Art of Problem Solving textbook on Prealgebra
http://www.artofproblemsolving.com/Store/viewitem.php?item=prealgebra in classes including third, fourth, and fifth graders) and is now hosted on the Epsilon Camp website. I'd be delighted to hear any commments any of you have about the FAQ link, and I have put the books kindly mentioned here into my Amazon wish list for likely future purchase for my own family, and maybe for my local classes too.
