Hardcover has some wear to the covers. No DJ. Pages tight and clean with a few underlines in text. Retired library copy with the usual marks and attachments. Pocket removed. 494 pages. Hardcover binding. Year: 1976 ISBN: 069000849X The author's purpose is to develop both teaching methods and content compatible with the central themes of elementary school mathematics. These topics and concepts are introduced without regard for grade placement since most teachers will be working within a textbook series, and the content at a particular level will be prescribed by the organization of that series. Suggested teaching methods and instructional devices are presented as a means of revealing the underlying mathematics, not as the ends of a process.