By Dolan, Williamson, and Muri. Provides hands-on, manipulative-based activities that involve future elementary and middle school teachers in discovering mathematical concepts, solving problems, and exploring mathematical concepts in interesting, stimulating, real-world settings. The activities are designed to be adapted for later use with elementary and middle school students. * Purpose outlines the major mathematical concepts developed in the activity. * Materials provides a list of supplies needed for the activity. * Grouping describes the classroom setting for the activity. * Getting Started provides an introduction to the activity and explains the preparation needed. * Reflections help students bring closure to ideas. * Extensions present suggestions and ideas for extending the activity to other mathematical topics or for making connections. * Manipulatives in color and on heavy paper stock are included. * Activity Masters contain models, activity recording sheets, graph paper, nets for polyhedrons, activity cards, etc.