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According to the divisibility test for 5, to determine whether a counting number is divisible by 5, you have to check only its ones digit. If the ones digit is 0 or 5, then the number is divisible by 5. Otherwise, it is not. Give a clear and complete explanation for why this divisibility test is a valid way to determine whether a number is divisible by 5, using your own words.
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Mathematics for Elementary Teachers with Activities, Books a la carte edition (5th Edition)
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