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How do you know if a number is divisi able by 7?

Updated: 8/18/2019
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13y ago

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generally, a number is considered divisable by another when it comes out to a whole number. for example, 8 / 2 equals 4, so they can be divided together. however, 9/2 = 4.5 so they can not be divided together in theory.

with the number 7, you can divide 7 / 1 and it equals 7. however, 7 / 2, 7 / 3, ... 7 / 6 do not work together. it can only be divided by itself and by 1, so it is considered a prime number.

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Q: How do you know if a number is divisi able by 7?
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