This handbook, developed by teachers in Manitoba, has been structured to provide teachers in grades 3 through 6 with a resource for teaching problem solving in mathematics. It consists of four sections. The first section establishes the background and states the purposes of the handbook. The second section provides a general overview of problem solving. It identifies two types of problems (routine and nonroutine) and outlines the step generally used to solve problems. Also described, with examples, are key problem-solving strategies commonly used in grades 3 through 6. The third section includes sheets of selected problems for each grade. Most of these problems are sorted according to strategies and are structured to interface with key mathematics topics in the curriculum. A curriculum chart for each grade is given, and additional sheets of problems, not identified with specific strategies, are also included. The fourth section contains a list of reference materials on problem solving. (MNS)