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Old 09-20-2015, 11:14 AM  
Sly
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Join Date: Sep 2004
Location: Austin, TX
Posts: 31,323
I'm very good at math in my head. Was never taught that way, but that's how I have always done it.

Or in that particular scenario, I would take one off of the bottom number and add it to the top number so that it is 30 (easier to work with) and then add the new number from the bottom.
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