Wednesday, March 24, 2010

The commutative rule

1+2=
2+1=

3+4=
4+3=

5+6 = 6+ _
9+3 = 3+_
2+7 = _ + 2
8+5 = 5 + _
_ + 3 = 3+4
7+_ = 4 + 7
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