DIVISIBILITY BY EIGHTEEN :
Rule: Any number which is divisible by 9 and has its last digit (unit-digit)
even (or zero), is divisible by 18.
Ex. 1. 926568 : Digit-sum is multiple of nine (je, divisible by 9) and
unit-digit (8) is even, hence the number is divisible by 18.
Ex. 2. 273690 : Digit-sum is multiple of nine and the number ends
in zero, so the number is divisible by 18.
Note: During the calculation of digit-sum, follow the method of "forget
nine". If you get zero at the end of your calculation, it means the
digit-sum is divisible by 9.
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