Patent ID: 7014468

Claim:
A teaching aid comprising one counting member representing a single digit, and sets of two, three, four, five, six, seven, eight, nine, and ten counting members each representing a single counting unit, the counting members of each set being pivotally interconnected for displacement relative to one another in the corresponding set, the one counting member and the counting members in each set having first and second sides, the first side of said one counting member and the first sides of the counting members in each set having indicia thereon including a shape and a color, the shape and color on the first sides of the counting members in each set being the same and being different from the shape and color of the indicia on the first side of the one counting member and the first sides of the counting members in each of the other sets, and the second sides of the one counting member and the counting members in each set having indicia thereon including the same shape as is on the first side of the corresponding counting member, and the indicia on the second sides of the one counting member and the counting members in each set including a color.