Instrument for practicing multiplication

Details Instrument for practicing multiplication Instrument for practicing multiplication

1987-10-15

1988-12-13

Yeung, James C.

Education and demonstration

Mathematics

Arithmetic

G09B 100

Patent

active

047907576

ABSTRACT:
An instrument for practicing multiplication to be used by children, in which there is a base plate, a printed plate fixed on the base plate, a group of horizontal cursors slidably installed on the base plate, a group of vertical cursors placed on top of the horizontal cursors and slidably installed on the base plate, and a top cover grass plate. These element are arranged as to calculate multiplication by sliding some of these two group of the cursors. One group of the cursors are given a sequence of numbers 1 to 9, and the other group of cursors are given the same sequence of numbers 1 to 9. When a number (X) of one group of cursors and a number (Y) of the other group of cursors are slided to one direction, a figure corresponding to the answer of X by Y and a group of marks equal to the answer are displayed on the instrument.

REFERENCES:
patent: 3061947 (1962-11-01), Faudree
patent: 3224114 (1965-12-01), Swanson
patent: 3456364 (1969-07-01), Alexander
patent: 4445865 (1984-05-01), Sellon

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