1 answer:
Thes first rule is correct.
Another way of doing it is:
Sum the digits of the number. If the result is divisible into nine, then the original number itself will also be.
Example:
18 = 1+8 = 9. 9 is divisible into 9.
27 = 2+7 = 9. 9 is divisible into 9.
Wish you luck!
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