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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
3.
Next, the digits of the products are added together. Two-digit
products are treated as two separate digits.
This is the sum of the digits.
2 + 0 + 2 + 6 + 6 + 1 + 6 + 5 + 4 + 3 + 3 + 6 = 44
4.
Divide the sum of the digits by the modulus (
10
in this case),
only to the whole number. The balance is called the
remainder.
4
10 44
40
4
5.
Subtract the remainder from the modulus.
The result becomes the check digit. In this case, the check
digit is
6
.
10 - 4 = 6
4-22
Defining Field Options