This book provides ideas, practical suggestions, and blackline masters to present mathematics concepts using cooperative learning activities in the primary grades. The first sections explain how to make cooperative learning part of the curriculum and include an overview, instructions, and activities for introducing cooperative learning to students and parents; guidelines for setting up groups; ideas for a special activity center; and suggestions for assessment and portfolios. The rest of the book provides a wide range of cooperative activities separated into: attributes and classification, games and rules, understanding numbers and numeration, understanding arithmetic operations, visualizing and representing shapes, dealing with data, location and mapping, process of measurement, measuring geometric figures, and exchange. Each activity unit contains a lesson plan that explains the purpose of the unit, the skills to be taught, the materials that are needed, procedures for teaching the unit, ways to simplify and expand the unit, a teacher script, and suggestions for evaluation and processing. (MKR)