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If you mean what is the divisibility rule for the number 8:

There are two:

1. For any power n of 2 the last n digits of the number must be divisible by 2 to the power n.

8 = 2³ → If the last 3 digits are divisible by 3, then so is the whole number.

2. Add the last (ones) digit to 2 times the tens digit to 4 times the hundreds digit; if this sum is divisible by 8, then so is the original number.

As the test can be repeated on the sum, repeat until a single digit remains. If, and only if, this digit is 8 will the number be divisible by 8.

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7y ago

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