Arithmetic teaching aid kit

Claim 1

An educational teaching aid kit for teaching arithmetic to beginning students comprising a container with a number of compartments therein, the respective compartments having respective groups of educational teaching materials therein, the educational teaching materials including a first group comprising compact pieces having a predetermined shape and being adapted for assembly by the student into concrete representations of sets, said educational materials also including a second group comprising series cards in which each respective card depicts a set of shapes, each shape being substantially identical to the shape of said compact pieces, said cards having the number corresponding to the respective number of depicted shapes depicted on the reverse side thereof, and a third group of educational material having predetermined large sets of said shapes depicted thereon arranged in a manner which enables the students to conveniently identify sub-sets, and in which the shapes are arranged along a pair of elongated parallel lines, and in which said kit includes means for covering all or parts of said shapes on the respective materials in said third group, said means comprising an elongated cover having one axial end thereof extending in a straight line across the width of said cover, and the other end thereof being notched to expose one more shape in one line than the number of shapes exposed at the unnotched portion of that edge, whereby an odd number of said shapes can be left exposed by said notched edge.