This volume presents a collection of activities and games for use in elementary school mathematics laboratories. The activities and games included were submitted by classroom teachers and were selected for their use of manipulative materials or their reliance on student interactions. Several of the activities included have been described in "The Arithmetic Teacher," but many are first published in this volume. Activities described are in eight subject matter categories: (1) number concepts, (2) addition and subtraction, (3) multiplication and division, (4) number skills review, (5) measurement, (6) fractions, (7) graphs and functions, and (8) geometric concepts. The goals of activities range from increasing speed and power in computational situations to concept learning, development of strategies, and discovery. Each activity description is in outline form and includes statements of goals and purposes materials needed, procedures involved, and activity source. Many descriptions include diagrams and instructions for making any necessary materials. (SD)