a quick math challenge

12272013, 04:16 PM
Post: #4




RE: a quick math challenge
Quote: I teach the divisibilityby3 rule to my middle school math students, but I know that it is promptly forgotten by the time they get to high school. Really? I thought that this rule is known to everyone and it's as nearly common knowledge as divisibility by 2. Even people that I would call innumerate know this when I've asked them. katie 

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