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The Arithmetic Model Kit consists of two ready-to-assemble models: A Mechanical Addiator and a Mechanical Multiplier. The Mechanical Addiator is a compact arithmetic machine (or adding machine) that works by moving gear racks, using a stylus included in the kit. The Mechanical Multiplier is a flat hinge mechanism that accomplishes binary operations on numbers. Assemble the Arithmetic Kit and discover how the Mechanical Addiator and Mechanical Multiplier work.