This guide describes activities and materials which can be used in a mathematics laboratory approach to a basic mathematics program for grades 1-6. Thirty-five activities pertaining to geometric concepts are described in terms of purpose, suggested grade levels, materials needed, and procedures. Some concepts included in the guide are: basic shapes, set classification, similarities, differences, symmetry, congruency, puzzle recreations, special properties of geometric figures, conservation, recognition of geometric shapes, geometric solids, geometric problem solving, geometric tool use (protractor, compass, ruler), pattern discoveries, measurements with polygons, vocabulary, relationships between area and volume, estimation, volume, fractional parts, and globe activities. The guide concludes with a list of selected manipulative materials for mathematics laboratory use. (JBW)