Arithmetic game board

Details Arithmetic game board Arithmetic game board

1977-11-21

1980-01-29

Grieb, William H.

G09B 1902

Patent

active

041854012

ABSTRACT:
An educational game board for teaching arithmetic. The game board has a group of holes in a grid arrangement with a first group of slides beneath and parallel to the holes in one direction, and a second group of slides beneath the first group of slides and parallel to the holes in the other direction. Each of the slides has a first position in which the slide is under the holes and a second position in which a hole in the slide is under the holes. There is a third group of slides disposed diagonally of the grid, each slide in the third group of slides having a first position in which the slide is under the holes and a second position in which a hole in the slide is under the holes.

REFERENCES:
patent: 1867888 (1932-07-01), Obidine
patent: 2910786 (1959-11-01), Cohn et al.

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