This volume is designed to provide information for teachers and prospective teachers who will teach the basic concepts of algebra normally taught in grade 9. Each section of the book contains background information, suggestions for instruction, and problems. Sections in the book include: (1) Numerals and Variables; (2) Open Sentences and English Sentences; (3) The Real Numbers; (4) Properties of Order; and (5) Additive and Multiplicative Inverses. Answers to problems are at the end of the book. (RH)