Introduction to Secondary School Mathematics, Volume 2, Teacher's Commentary, Unit 42. Revised Edition.

This is volume two of a two-volume manual for teachers using SMSG text materials for students in grades 7 and 8 whose mathematical talents are underdeveloped. The overall purpose for each of the chapters is described and the mathematical development detailed. Background information for key concepts, answers for all exercises in each chapter, and suggested test items are provided. Chapter topics include: linear measurement, area and volume, angles and parallels, polygons and prisms, circles, statistics and graphs, negative rational numbers, equations and inequalities, coordinates in the plane, real numbers, and scientific notation, decimals, and the metric system. (MN)