Apparatus for teaching the addition and subtraction of whole num

Details Apparatus for teaching the addition and subtraction of whole num Apparatus for teaching the addition and subtraction of whole num

1994-09-29

1996-06-25

Hilten, John S.

Education and demonstration

Mathematics

Arithmetic

434193, G09B 102

Patent

active

055294979

ABSTRACT:
Apparatus for teaching the addition and subtraction of whole numbers through the use of objects comprising a sheet with three containers across in a row, the containers of the row being separated by a mathematical sign (+ or -), and the second and third containers being separated by an equals sign (=); and a plurality of objects, the objects being of a similar shape but with distinctive markings thereon; whereby when some of the devices are placed in the first container and others in the second container, the third container may be filled by the child with the objects representing the result of the mathematical process to be performed.

REFERENCES:
patent: 3874096 (1975-04-01), Romstad
patent: 4808111 (1989-02-01), Pratt
patent: 4884973 (1989-12-01), Pak
patent: 5040987 (1991-08-01), Frazier
patent: 5167505 (1992-12-01), Walsh

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