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divisibility rule for 4: divisible by 2 for twice or number formed by last two digits are divisible by 4.
divisibility rule for 6: if the integer is divisible by BOTH 2 and 3
divisibility rule for 8: if the integer is divisible by 2 THREE TIMFS, or if the lAST THREE digits are
divisible by 8

9 if the SUM of the integer's DIGITS is divisible by 9
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If you add or subtract multiples of N, the result is a multiple of N.
You can restate this principle using any of the disguises above:
for instance, if N is a divisor of x and of y, then N is a divisor of x +y.
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