Teaching aid for mathematics

Details Teaching aid for mathematics Teaching aid for mathematics

1977-05-02

1978-08-22

Grieb, William H.

35 9H, G09B 1902

Patent

active

041078551

ABSTRACT:
An arithmetic teaching aid for demonstrating the spatial relation between positive and negative numbers to enable the teaching of operations in the set of integers, and includes a mirror surface with an arm projecting at an angle of 90.degree. therefrom and having positive integer means spacedly and vertically arranged thereon so that the integers reflected by the mirror surface will indicate to students viewing from the front negative integers and their relationship with the positive integers.

REFERENCES:
patent: 1346017 (1920-07-01), Goodman
patent: 1977842 (1934-10-01), Badanes
patent: 3212202 (1965-10-01), Heinichen
patent: 3333350 (1967-08-01), Hopkins
patent: 3339296 (1967-09-01), Chuy
patent: 3486244 (1969-12-01), Horn

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