Games and activities which involve problem solving are presented in order to help teachers develop the numeric, geometric, and logical thought processes of elementary school students. The activities and games (many of which are pencil-and-paper) require using logic, plan-ahead strategies, spatial reasoning, strategies based on prior patterns or experience, or some combination of these. Instructions and materials are provided for seven games, most of which involve two players, and for 10 problem-solving activities which can be done individually. (DC)