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September 21, 2014

September 21, 2014

Posted by **John** on Tuesday, May 22, 2012 at 9:58pm.

- math -
**MathMate**, Tuesday, May 22, 2012 at 10:00pmSum and difference problems can be solved mentally.

The bigger number is half of the 24+10=17 and the smaller number is half of 24-10 =7.

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