So many people have suggested to us that they would love to have a book that helped parents review their math skills that we began to consider writing such a book. About the time we decided such a project would be feasible, we saw a piece in a magazine about an actress who had been going to her son's grade-school class to learn the math he was studying. So, we were further motivated to come up with a book we think will help all those varied folks who do homework with their kids. We hope you find the result very helpful!