1975-09-26
1976-12-07
Grieb, William H.
35 77, G09B 1902
Patent
active
039953785
ABSTRACT:
A mathematics visual aid particularly useful in teaching subtraction to both slow and fast learners. The apparatus includes in a preferred embodiment form a support structure having a plurality of vertical divider members which define a plurality of working compartments or work areas. The compartments are arranged in columns, from right to left, which correspond to the increasing place-value components 1, 10, 100, 1,000 . . . etc. Affixed within each of the plurality of columns is a unique set of workpieces such that each column is associated with one place-value component. Each workpiece comprises a substantially cylindrical body having a shaft extending axially therethrough. Extending upwardly from a portion of the cylindrical surface of each workpiece are integrally formed information-bearing indicia which, within each column, identify that column's place-value. A pivot pin extends through the shaft of a plurality of adjacent column's workpieces such that the latter are made rotatable which permits selective exposure of the information-bearing indicia of each workpiece during the working of a problem. Each column of compartments consists preferably of two rows, one of which has rotatably mounted therein nine workpieces, the other of which has mounted therein ten workpieces. The apparatus is designed to visualize in a most elemental manner the concept of re-grouping a higher order place-value component into a lower order place-value component so as to facilitate the teaching process associated with subtraction.
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patent: 3908287 (1975-09-01), Darnell
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