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Add together the digits of the number to be divided by 3. If the sum is 3 or a multiple of 3 then the number is divisible by 3.

Example : 5681 ; 5 + 6 + 8 + 1 = 20 which is not a multiple of 3 so 5681 is NOT divisible by 3.

477 ; 4 + 7 + 7 = 18 which is a multiple of 3 so 477 is divisible by 3.

NOTE : When adding the digits, the digits of the total can be summed to determine if the original number is divisible by 3. In the example 4 + 7 + 7 = 18 then 1 + 8 = 9, and 9 is a multiple of 3 so confirming that 477 is divisible by 3.

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