Circular, piece-matching math educational aid

Combination writing board and abacus

Computerized system and method for visually based education

Computerized system for teaching geometry proofs

Cuboid block, instructional device for multiplication tables

Device and method for teaching mathematical properties...

Device for teaching decimal math

Didactic-educational toy for elementary arithmetic operations, r

Die having magic squares

Display polyhedra having marked and unmarked paired opposing fac

Double-beam math balance

Education system kit

Educational aid for mathematics

Educational aides and methods

Educational amusement device for matching words with non-verbal

Educational and entertainment device

Educational and recreational mathematical kit in the form of a s

Educational bank

Educational building toy

Educational card system