Cuboid block, instructional device for multiplication tables

Details Cuboid block, instructional device for multiplication tables Cuboid block, instructional device for multiplication tables

1983-01-06

1984-08-21

Grieb, William H.

Education and demonstration

Mathematics

Arithmetic

434208, 434209, 434403, G09B 100, G09B 1902

Patent

active

044667990

ABSTRACT:
An instructional toy device for multiplication computation formed by a string of cuboid blocks having an interconnecting elastic string permitting equal segments of multiple blocks to be folded in a back and forth arrangement of aligned rows, the blocks each being individually marked with a number progressing in an ordinary arithmetic series of increasing units from an end block marked 1 to an end block marked with the number of the total blocks in the string, a multiplication computation being represented by a selected number equalling the number of blocks in a segment and a multiple equalling the number of rows, the product of which is the numerical marking of the last block in the segment of the last row.

REFERENCES:
patent: 2063287 (1936-12-01), Aikins
patent: 3628261 (1971-12-01), Thompson
patent: 3999310 (1976-12-01), Lufkin et al.

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