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Any number that is divisible by 9 is also divisible by 3, so it is enough to choose a number that is divisible by 9. Here are two ways you can do this:

1) Choose a number so that the sum of the digits are 9, or a multiple of 9 (that is, 9, 18, or 27 in this case).

2) The more general solution (that works for other numbers, not just 9) is to divide the smallest 4-digit number (1000) by 9. Round the result up, and multiply by 9 again. If you want a larger number, say, one that is close to 4000, divide 4000 by 9, round the result up or down, and multiply by 9 again.

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12y ago
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Q: What is a four digit number divisible by 9 and 3?
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