Arithmetic counter

Details Arithmetic counter Arithmetic counter

1989-10-30

1991-02-19

Apley, Richard J.

Education and demonstration

Mathematics

Arithmetic

434203, G09B 100

Patent

active

049939521

ABSTRACT:
An arithmetic counter that includes a U-shaped support structure for a horizontal rod. Consecutively numbered beads are slidably arranged on the rod for adjustment to positions wherein selected numbers of the beads are separated from the remaining beads. One or more marker boards are adopted to be hung from the rod between the separated beads and the remaining beads, such that a small child can count the beads and achieve and better understand "addition" and "subtraction" processes.

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patent: 4295832 (1981-10-01), Karell
patent: 4671514 (1987-06-01), Wilson-Diehl
patent: 4722713 (1988-02-01), Williams et al.
patent: 4884973 (1989-12-01), Pak
Cleo Learning Aide; 1971; p. 39.

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