Educational and recreational mathematical device in the form of

Details Educational and recreational mathematical device in the form of Educational and recreational mathematical device in the form of

1978-08-18

1983-11-22

Shepperd, John W.

Education and demonstration

Mathematics

40329, 283 1R, 63 1R, G09B 1902

Patent

active

044166338

ABSTRACT:
An educational and recreational mathematical device comprises a ring or set of concentric rings or a band made endless or adapted to have ends thereof fastened to make them endless and a plurality of individual digits imprinted on the band or each ring at regularly spaced intervals. The digits when all read consecutively as a number constitute a quotient obtained by dividing a number constituted of (p-1)
nines, in which P is a prime number greater than 5 and n is an integer at least 1, by P and adding to the left-hand end of said quotient any number of zeros necessary to increase the number of digits in the quotient to (p-1)
or a specially chosen multiple of the quotient thus derived, n being so selected that (p-1)
nines is the minimum number of nines divisible by P so that the quotient is an integral number.

REFERENCES:
patent: 2749555 (1956-06-01), Oliveira
patent: 2796680 (1957-06-01), Wittcoff

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