Patent Document ID: 4014113
Application ID: 05648113

Base Claim:
1. Apparatus for improving the skills of mathematical computation and alphabet usage, comprising a computation selector in combination with an answer verifier, i. said computation selector consisting essentially of a problem board member and a selector member, said problem board member having a central point, means uniting said computation selector members together for relative rotary movement of one with respect to the other about said central point of said problem board member, said problem board member carrying on it visible indicia arranged in circumscribing fashion about said central point, said indicia including an inner array of primary numbers and an outer array of secondary numbers, said inner array comprising at least two said primary numbers, each said primary number being separated from adjacent ones thereof by a primary radial line separator, whereby each said primary number lies within a radial primary segment about said central point, said outer array of secondary numbers being radially outward from said primary numbers and being arranged with at least three said secondary numbers within the arc ambit of each said radial primary segment, each said secondary number lying within a radial secondary segment defined by secondary radial line separators between said secondary numbers, substantially all of said secondary numbers having associated therewith a visible letter code, each said letter code being representative of the numerical value of the correct answer for a predetermined mathematical computation between the said secondary number with which said letter code is associated and the primary number within the arc ambit of whose radial primary segment the said secondary number is located, different said correct answer numerical values being represented by a different said letter code, ii. said answer verifier comprising an answer board member and a visibly distinct identifier member, means uniting said answer verifier members together for relative indexing movement of one with respect to the other, said answer board member carrying on it indicia comprising each said letter code appearing on said computation selector, each said letter code on said answer board member having in uniform association with it the numerical value of said correct answer for the aforesaid predetermined mathematical computation, the said correct answer numerical value associated with each letter code on said answer board being visually apparent and identified by said identifier member when said identifier member is indexed to visually mark said letter code with which said correct answer numerical value is associated.

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Claim 6:
6. The apparatus of claim 1 wherein said primary numbers are multipliers, said secondary numbers are multiplicands, said predetermined mathematical computation is multiplication, and each said correct answer numerical value is that for multiplication between said primary and secondary numbers.