This valuable collection of materials was developed to incorporate the calculator as an instructional aid in ninth- and tenth-grade general and basic mathematics classes. The materials are also appropriate for grades 7 and 8. After an introductory section which teaches the use of the calculator, four games and activities are described. For these and subsequent lessons, prior knowledge needed, objectives, materials, and directions are clearly stated. The third set of lessons is on exploring algorithms, with multiplication by tens, hundreds, and thousands considered. Pattern searches comprise several lessons; estimation, calculating in circles, consumer applications, and environmental applications are the focus of remaining sets of lessons. An annotated list of references is also included. All materials are in a form ready to be used by teacher and copied for students. (MS)