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11 is a tricky one, but this is how:

if the sum of every other digit minus the sum of all the other digits equals a multiple of 11

example:

Q: Is 164725 divisible by 11?

A: Yes. and this is why... first you take every other digit 164725, then add them 6+7+5=18. Now take the rest of the numbers 164725 and add them, 1+4+2=7. After that subtract them, 18-7=11, and 11 is a multiple of 11 (11x1=11).

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Q: How do you know if a number is divisible by 11?
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