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| add all the numbers together and the sum is divisible by 3 |
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| the last two digits are divisible by 4 |
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| the number ends in 5 or 0 |
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| if the number is divisible by 2 and 3, it's also divisible by 6 |
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| double the last number and subtract it from the other numbers and the difference should be divisible by 7 |
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| See if the last 3 digits are divisible by 8 |
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| add all the numbers together and the sum is divisible by 9 |
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