This is a set of 8 x 11-inch cards containing ideas for manipulative materials, generally inexpensive household items, for use in the elementary classroom. The cards are tab-indexed into seven categories: sets (which is subdivided into set recognition and set operations), number-numerals, geometry, measurement, probability, number theory, and function. Each card states objectives, the supplies needed, and suggested activities. The activities described are flexible in nature, and possible additional activities are suggested. (JM)