The purpose of this project is to teach learning and understanding of mathematics at grades seven through nine through the use of science experiments. Previous knowledge of science on the part of students or teachers is not necessary. Lists of needed equipment are found at the beginning of this volume. It is strongly recommended that teachers try each experiment before it is done in class. The material in this part of the program can be covered in four weeks. The material in this book is used to develop the concepts of negative numbers, the basic properties of the real number system, linear functions, and quadratic functions. Included in the Teacher's Commentary are background information, discussion of activities and exercises, and answers to problems. (RH)