E-Z Math
"Study manuals often provide only the procedures needed to complete basic mathematics exercises. In contrast, this book attends to the conceptual understanding of many topics. . . . including questions designed to make users think deeply about the mathematics involved. . . . The attention to reasoning and conceptual understanding is commendable. For this reason, those who want to brush up on their school mathematics--from parents to students wanting to be better prepared for college algebra--will find this manual a useful resource.--Mathematics Teacher