Visualize a plus sign between each number.
It is used to determine if a number is divisible by 3, 9 or 27
38,490
3+8+4+9+0=24
3 goes into 24 without a remainder so it goes into 38,490
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sum
None. The sum of one digit can't be twice the size of the digit.
9
The sum of the individual digit is itself
300