Question
Test the divisibility of the following numbers by $9: 3333$
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Answer
A number is divisible by $9$ if the sum of its digits is divisible by $9$.
$3333$ is not divisible by $9$, because the sum of its digits, $3 + 3 + 3 + 3,$ is $12,$ which is not divisible by $9$.
$3333$ is not divisible by $9$, because the sum of its digits, $3 + 3 + 3 + 3,$ is $12,$ which is not divisible by $9$.
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