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Add 4 times the hundreds digit to twice the tens digit to the units digit. If this sum is divisible by 8, then the original number is divisible by 8.

If this summing is repeated until a single digit remains, if this digit is 8, then the original number is divisible by 8 otherwise it gives the remainder of the original number divided by 8 (unless it is 9, in which case the remainder is 9 - 8 = 1).

7 x 4 + 9 x 2 + 6 = 28 + 18 + 6 = 52

5 x 2 + 2 = 12

1 x 2 + 2 = 4

4 is not 8, so 796 is not divisible by 8 (the remainder is 4).

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