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7) A number is divisible by
If the sum of the digits can be divided by nine.

2 Answers

6 votes

A number is divisible by 9 if it's sum of digits can be divided by nine.

User Andrew Dunaway
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a number is divisible by 9 if the sum of its digits is divisible by 9 for large numbers this rule can be applied again to the result...
User Meloney
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