235 TMD Phone Keypad Number Puzzle
Published July 15, 2016
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8 min
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    You know your phone’s keypad is arranged into three rows and three columns of numbers, but did you know there’s a pretty cool math puzzle hidden in there, too? Keep on listening to The Math Dude to find out how to solve it! Read the transcript: http://bit.ly/1LqGcjm
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