Addition and subtraction teaching aid
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United States of America Patent
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Jun 30, 2015
Issued Date -
N/A
app pub date -
Feb 19, 2013
filing date -
Feb 19, 2013
priority date (Note) -
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Abstract
A device and method of use for carrying out addition and/or subtraction problems is disclosed. The device has two circular dials rotatable with respect to one another. Each dial has at least one set of sequential numbers, and at least one selector allows for selection of a number on at least one of the dials. By rotating the circular dials in position, and selecting a number to be added or subtracted, one then is able to see correct mathematical equations around the entire circle.
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