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Show corresponding math facts #4

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dulrich15 opened this issue Apr 6, 2014 · 0 comments

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dulrich15 commented Apr 6, 2014

What I mean is that if the fact is 5 + 2 = 7, create a mechanism to show

The inverse fact, 7 - 2 = 5
The commutative fact, 2 + 5 = 7
And, I suppose, the inverse of the commutative fact, 7 - 5 = 2

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