The purpose of this project is to help teachers of mathematics use the computer to aid the teaching and learning of many mathematical concepts in a meaningful way. To this end, commercially available software packages are described which are versatile, cost effective, and easy to use. A review and several lessons, each including homework exercises, have been written for each package and are presented in ready-to-use form. Chapter 1, "The Factory," presents four lessons simulating an assembly line. Chapter 2, "Gears: Strategies in Problem Solving," contains four lessons of puzzle building and solving. Chapter 3, "Building Perspective," provides four lessons for developing visual thinking skills (spatial perception and spatial reasoning). Chapter 4, "The Geometric Supposer: Triangles," includes lessons on random points of triangles, medians of a triangle, and Heron's formula. Chapter 5, "The Geometric Supposer: Quadrilaterals," offers two lessons about areas of parallelograms and quadrilaterals. All five software packages reviewed are published by Sunburst Communications. (YP)