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If a numbers digits add up to a number that is divisible by nine, the number is divisible by nine. Example~ 486 4+8+6=18 Since 18 is divisible by 9, 486 is divisible by 9. 561 5+6+1=12. 561 isn't divisible by 9.

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โˆ™ 2008-10-26 00:52:10
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Q: How do you find the divisibility rule for nine?
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