If the sum of its digits add up to 9
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Yes, every number that's divisible by 9 is divisible by 3
Any even number divisible by 9, if the sum of the digits is divisible by 9. If it's an even number divisible by 9, it's divisible by 18.
A number is divisible by 9 if a whole number of 9s can go into it and leave no remainder.
NO. 1110 is not divisible by 9. A number is divisible by 9 if the sum of its digits is divisible by 9. 1110 = 1 + 1 + 1 + 0 = 3 (3 is not divisible by 9, thus, 1110 is not divisible by 9.)
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