Why you can test whether a number is divisible by 3 by adding the digits:http://www.khanacademy.org/math/arithmetic/factors-multiples/v/the-why-of-the-3-divisibility-rule …
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Why you can test whether a number is divisible by 3 by adding the digits:http://www.khanacademy.org/math/arithmetic/factors-multiples/v/the-why-of-the-3-divisibility-rule …
