Mathematics teaching device

Details Mathematics teaching device Mathematics teaching device

1982-09-29

1984-01-03

Grieb, William H.

Education and demonstration

Mathematics

Base conversion or use of base other than ten

434191, G09B 1902, G09B 110

Patent

active

044240392

ABSTRACT:
A mathematics teaching device wherein a display surface is divided into eight regions. The first region contains one hundred colored and numbered plaques removably mounted in ten rows. Plaques are within five color groupings and the rows are color-coded as are receiving pockets. Two regions have another set of plaques with an adjacent receiving pocket to permit simple mathematical operations to be performed therein. The other regions are marked for additional operations to be performed therein.

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patent: 1490858 (1924-04-01), Seegers
patent: 2304893 (1942-12-01), Dickson
patent: 2474447 (1949-06-01), Wheelock
patent: 2502238 (1950-03-01), Wade et al.
patent: 2867045 (1959-01-01), Millgate
patent: 2946135 (1960-07-01), Eickmeyer et al.
patent: 3263347 (1966-08-01), McCutcheon
patent: 3357116 (1967-12-01), Bazacos
patent: 3374558 (1968-03-01), Smith, Jr.
patent: 3430362 (1969-03-01), Jacobson
patent: 3540873 (1970-06-01), Stobbe

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