1979-06-20
1980-07-15
Skogquist, Harland S.
35 9R, G09B 1902
Patent
active
042121183
ABSTRACT:
A system of children's blocks for teaching arithmetic, comprising various types of arithmetic operation blocks, and a number of answer blocks. Each block has a rod dimensioned in accordance with a predetermined numerical value. Addition blocks contain a linearly slidable rod having a portion protruding from the block a distance corresponding to a numerical value printed on the block. When two or more addition blocks are aligned, the rods of said blocks push against each other, to cause the rod of one of the end blocks to protrude a distance corresponding to the sum of the values of the mutually engaged blocks. An answer block contains a "Yes" light and/or an audible bell chime coupled to electrical sensing switches which are positioned so that an indication of correct result is displayed only when the protruding portion of the rod of an engaged addition block corresponds to a value associated with the answer block utilized. Thus the child can successfully engage addition blocks with an answer block only when the value of the answer block corresponds to the sum of the values of the addition blocks. Subtraction is taught by the use of negative value addition blocks. Multiplication and division blocks are of the same form as addition and subtraction blocks respectively, but have dimensions logarithmically proportional to the corresponding numerical values. The same answer blocks are used for all four arithmetic processes, and may also be employed for chain calculations.
REFERENCES:
patent: 1974901 (1934-09-01), Stadler
patent: 3504449 (1970-04-01), Kobler
patent: 3571950 (1971-03-01), Walker
patent: 3696533 (1972-10-01), Mortensen
Baldwin Blair F.
Stoddard Deborah
Baldwin, Stoddard & Company
Skogquist Harland S.
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