DIVISIBILITY BY THREE :Rule: If the sum of the digits of a number is divisible by 3, the number is also divisible by 3.
123 : 1+2+3 = 6 is divisible by 3; hence 123 is alSo divisible by 3.
5673 : 5+6+7+3 = 21; therefore divisible by 3.
89612: 8+9+6+1+2 = 26 = 2+6 = 8 is not divisible by 3, therefore, the number is not divisible by 3.
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