Fraction exploration device

Details Fraction exploration device Fraction exploration device

2005-01-11

2005-01-11

Lee, Michael G. (Department: 2876)

Registers

Calculators

Input-output calculator to indicator, printer, etc.

Reexamination Certificate

active

06840439

ABSTRACT:
A fraction exploration device for teaching various mathematical principles related to fractions, comprising a base sheet having printed indicia thereon, a ruler attached pivotally to the base sheet. The printed indicia on the base sheet include intersecting grid lines which define a matrix of intersections and a series of parallelograms therebetween. Fractions are located at a plurality of the intersections of the grid lines, each fraction having a numerator, a denominator and a dividing line separating the numerator from the denominator. The dividing line of each fraction is sloped to represent a mathematical relationship of the numerator to the denominator.

REFERENCES:
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patent: 3272431 (1966-09-01), Dablo
patent: 3369745 (1968-02-01), Merz
patent: 3870225 (1975-03-01), Murphy
patent: 3946207 (1976-03-01), Williams
patent: 5033200 (1991-07-01), Leung

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