A practicum intervention was designed and implemented over an 8-month period for the purpose of enhancing the mathematics-related cognitive and social interaction skills of primary school students in five kindergarten one pre-first, and seven first grade classrooms. Students interacted in group discussions and activities involving interest centers, brainstorming, and deductive reasoning. Manipulative activities were provided. These included cut-and-paste activities, manipulative games, illustrating activities, and charting activities. Teachers shared ideas that enhanced problem-solving activities. Practicum evaluation data indicated that the intervention was effective in improving students' cognitive and social skills in mathematics lessons. Teachers and parents grew in their ability to facilitate mathematics problem solving. Related materials, including sociogram data, checklists for recording observations on children and teachers, a teacher questionnaire, and checklists on lesson plans and behavior in conferences, are included. (Contains 42 references) (RH)