This book contains a classroom-tested approach to the teaching of problem solving to all students in Grades 6-8, regardless of ability. Information on problem solving in general is provided, then mathematical problems on logic, exponents, fractions, pre-algebra, algebra, geometry, number theory, set theory, ratio, proportion, percent, probability, charts and topology are presented. Answers to all problems are included. A problem-solving portfolio, a math myths exercise, a matrix of problem-solving concepts, and a matrix of problem-solving strategies are appended. (ASK)