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4. Divide the sum of the products by the modulus (10 in this
case), only to the whole number. The balance is called the
remainder.
9
10 98
90
8
5. Subtract the remainder from the modulus.
The result becomes the check digit. In this case, the check
digit is 2.
10 - 8 = 2
Sum of Digits Calculation
This is an example of how the printer uses Sum of Digits to
calculate a check digit for this data:
5 2 3 2 4 5 2 1 9
1. Weights are applied to each digit, starting with the last digit in
the weight string. They are applied right to left, beginning at
the right-most position of the field. Remember, a weight
string must contain at least two different numbers. This
example has a weight string
of 1,2,3,4.
field: 5 2 3 2 4 5 2 1 9
weight string:
4 1 2 3 4 1 2 3 4
2. Each digit in the field is multiplied by the weight assigned to it:
field: 5 2 3 2 4 5 2 1 9
weight string:
4 1 2 3 4 1 2 3 4
products: 20 2 6 6 16 5 4 3 36
5-16 Defining Field Options