The purposes of this study were 1) to determine the effect upon the arithmetic computation, concepts, and application skills of pupils when the regular instructional program in arithmetic at the fifth- and seventh-grade levels was supplemented with the Cyclo-Teacher (2) programmed materials; 2) to determine the effect upon the arithmetic computation, concepts, and application skills of pupils when the regular instructional program in arithmetic at the fifth- and seventh-grade levels was supplemented with the Mental Computation (6) materials.