Multiplication learning aid device

Details Multiplication learning aid device Multiplication learning aid device

1975-12-17

1977-04-05

Grieb, William H.

G09B 1902

Patent

active

040153452

ABSTRACT:
A device designed to be used in elementary school classrooms in conjunction with an overhead projector to teach and enforce the concept of multiplication to students, the device having a square board with a vertical row of encircled numbers along one edge and a horizontal row of encircled numbers along the top edge with a series of colored circles covering the board with one circle provided at each point on the board where a vertical number and a horizontal number intersect, the device being further provided with an insert slidable in and out of the bottom of the board to protect the board when not in use, two inserts toward the top of the device to cover the numbered board which can be moved in or out of the board to progressively uncover or cover either the vertical and/or horizontal rows of circles, so that the inserts can be moved to display combinations of different numbers on a screen or suitable surface by means of an overhead projector to visually teach students the multiplication table.

REFERENCES:
patent: 898587 (1908-09-01), Matthias
patent: 3253358 (1966-05-01), Wright
patent: 3432943 (1969-03-01), Merkel

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