Part of a series of experimental units for students at the preschool level, this unit is designed to develop number concepts through counting. A short discussion of the mathematical background, an outline of the unit, a discussion of the objectives, a list of materials needed, and sequences of learning activities for the children are included. The student's workbook is included in the appendix. For other documents in this series, see SE 016 124 through SE 016 129. (Author/DT)