Math Lab: Casting Out Nines
5/3/2013 9:48:00 PM
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How do you feel about checking your work after you’ve labored for minutes solving a mathematical problem? Learn this diabolically easy procedure, called casting out nines, right here
. Do the problems presented, and learn the password that will take you to the treasure page. This method of checking math calculations is included in Quick and Easy Mathematics
, a book written by science fiction author Isaac Asimov.