Education and demonstration – Mathematics – Arithmetic
Patent
1979-05-22
1981-03-24
Skogquist, Harland S.
Education and demonstration
Mathematics
Arithmetic
G09B 2304
Patent
active
042571758
ABSTRACT:
A mathematics teaching apparatus comprises at least one set of rectanguloid elements of different shapes and of dimensions equal to 1, 3, 5 and 7 times a common unit or module. The set comprises a plurality of cubic blocks having an edge length equal to 1 unit, bars of unit width and thickness and lengths equal to 3, 5 and 7 units, square slabs of unit thickness and side lengths equal to 3, 5 and 7 units and rectangular slabs of unit thickness and side length combinations 3.times.5 units, 3.times.7 units and 5.times.7 units. Preferably the apparatus comprises two or more such sets which differ in color. The apparatus is useful for demonstrating and explaining various fundamental algebraic formulations and processes, including the algebra of 3-dimensional figures, and mathematical expressions comprising algebraic and whole number terms.
REFERENCES:
patent: 1471437 (1923-10-01), Wood
patent: 3208162 (1965-09-01), Wisdom
Cleo Learning Aids Catalog, Feb. 1976, pp. 39, 82, 102 only, items 1D7566, 1D3600, 6200. _
Welch Sci. Co. Catalog 1965, Decimeter Cube p. 39. _
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