Education and demonstration – Mathematics
Patent
1999-05-28
2000-05-02
Hafer, Robert A.
Education and demonstration
Mathematics
434191, 434207, 273292, G09B 1902, G09B 2302
Patent
active
060565535
ABSTRACT:
A math playing and training system is disclosed. The system comprises two sets of playing pieces, each having a pair of numbers on both sides. The first set has ten pairs of numbers with each pair having a number on the back one number less than that on the front. Besides one pair of symbols of "+" and "-", the second set has 9 pairs of numbers with each having two numbers equal to a sum of 10. For these 9 pairs of tiles there is a symbol of "-" on the front and "+" on the back. A turnover of two tiles at the same time gives players a direct result for addition or subtraction, and a better understanding of regrouping and pair concepts. The system employs the playing pieces and the pair concepts for playing and training in a vertical math operations specially in the fields of addition and subtraction. The system helps math beginners to master basic concepts of addition and subtraction and to reach the stage of mental arithmetic through entertaining playing and systematic training.
REFERENCES:
patent: 705579 (1902-07-01), Gibson
patent: 894043 (1908-07-01), Oldroyd
patent: 1115441 (1914-10-01), Lake
patent: 1279504 (1918-09-01), Blau
patent: 1323986 (1919-12-01), Joyce
patent: 1696987 (1929-01-01), Troidl
patent: 1696988 (1929-01-01), Troidl
patent: 1699629 (1929-01-01), Phifer
patent: 4281835 (1981-08-01), Seiden
Hafer Robert A.
Miller Bena B.
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