This manual provides a resource for mathematics teachers who wish to take advantage of the extensive library of computer software materials available to expand and strengthen classroom instruction. Classroom management procedures, software duplication guidelines, copying procedures of diskettes for MS DOS and Apple II computers, and methods for managing diskettes are described. Included are 109 classroom activities for teaching mathematical concepts using computers. The aim, objectives, vocabulary, materials, preparation, motivation, development, application, summary, and homework are provided for each activity. Activities are classified into the following categories: (1) Numbers and Numeration; (2) Addition; (3) Subtraction; (4) Multiplication; (5) Division; (6) Fractions; (7) Decimals; (8) Geometry; (9) Signed Numbers; (10) Measurement; and (11) Data and Graphing. A list of 32 software programs used in this guide is presented. (YP)