Abacus calculator

Abacus with each counter held in position by friction or magneti

Apparatus and method for teaching addition and subtraction

Apparatus and method for teaching concepts of mathematics

Apparatus for teaching numbers and mathematics

Apparatus for teaching the addition and subtraction of whole num

Apparatus for use in teaching mathematics

Apparatuses and kits for teaching mathematics

Arithmetic counter

Arithmetic educational device

Arithmetic instruction apparatus

Arithmetic teaching device

Arithmetical teaching aid

Assembly including interlocking components for teaching mathemat

Base--ten blocks employing single, attachable blocks of one colo

Bead calculator educational toy

Blocks with mating bosses and recesses which bulge for interfere

Calculation training tool, and calculation training system

Child's doll useful for teaching counting, color identification,

Childs counting book