If the sum of its' digits are divisible by 3 for all numbers greater than 9.
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If the sum of the digits is a multiple of 3, the whole number is divisible by 3.
If it's even and divisible by 3, it's divisible by 6.
If the sum of the digits can be divided by 3. 93 is divisible by 3 because 9+3=12 we know 12 is divisible by 3 because 1+2=3 so the number is divisible by 3.
Divisibility if a number by 3 is not determined by its last digits: instead it is determined by the number's digital root.You get the digital root of a number by adding together all its digits. If the answer is a big number, then find the digital root of the answer. Keep going until you have a number that is smaller than 10. If this number is 3, 6 or 9 (all divisible by 3) then the original number is divisible by 3. And it not, it is not.
2, 5, 10 Yes 3, 4, 6, 9 No.