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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
3.
Next, the product of each digit is added together. This is the
sum of the products.
20 + 2 + 6 + 6 + 16 + 5 + 4 + 3 + 36 = 98
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
Defining Field Options
4-11