Education and demonstration – Mathematics – Arithmetic
Patent
1988-01-11
1989-02-28
Grieb, William H.
Education and demonstration
Mathematics
Arithmetic
434205, G09B 1902
Patent
active
048081116
ABSTRACT:
A mathematics educating device includes a number rack having a plurality of number recesses; a plurality of number plates, each number plate bearing a numeral selected from the sequence 1, 2, 3, 4, 5, 6, 7, 8, 9, 1, 0; an operator rack having a plurality of operator recesses; a plurality of operator plates, each operator plate bearing a mathematical operator; and a practice rack having at least three number practice recesses and at least one operator practice recess arranged for vertical or horizontal addition, subtraction, multiplication, and division. Each number recess has a unique shape and each number plate bearing a different numeral has a unique shape so that each number plate bearing a different numeral will fit within only one number recess and all number plates bearing the same numeral will fit within the same number recess. Similarly, and for the same purposes, each operator recess has a unique shape and each operator plate bearing a different mathematical operator has a unique shape. Each number practice recess of the practice rack is shaped to receive any of the number plates and each operator practice recess of the practice racks is shaped to receive any of the operator plates. The number recesses are further identified by a quantity of indicia on the number rack near each number recess. The number plates are further identified by a quantity of indicia on each number plate.
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