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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 p

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.

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A mathematical instruction device comprising: a cuboid block string having a plurality of equal sized cuboid blocks with at least one exposed face having a numerical marking wherein said blocks are oriented on said string with said numerically marked faces in a common plane; and, an articulated inte

A mathematical instruction device comprising: a cuboid block string having a plurality of equal sized cuboid blocks with at least one exposed face having a numerical marking wherein said blocks are oriented on said string with said numerically marked faces in a common plane; and, an articulated interconnection means interconnecting adjacent blocks in said string for select folding of predefined segments of consecutive blocks into multiples of uniformly aligned, conjunctive rows; and, wherein successive blocks in said string have said numerical markings progressing in an increasing consecutive arithmetical series from a first end block marked one, to a second end block marked with a numerical marking equal to the total number of blocks in the string; and, wherein for mathematical computations, said block string is folded at select points between adjacent blocks into multiple, uniformly aligned, conjunctive rows of preselected block segments commencing from said first end block in a continuous numerical series to a block at the end of a last segment, with said marked faces in a common plane, the numerical marking of the end block of the last segment being the solution to the mathmatical computation.