HP 3000 Manuals HP 3000 Manuals
Modulus 11 Self-Check Digit
To calculate the modulus 11 self-check digit, follow these steps:
1. Assign a multiplication factor to each digit position of your
number as follows: starting with the rightmost position of your
number, assign the numbers 2, 3, 4, 5, 6, 7, 2, 3, 4, 5, 6, 7,
2,...from right to left.
Example: If your number is 1 2 3 4 5 6 7, the multiplication
factor is assigned as follows:
Your number: 1 2 3 4 5 6 7
Multiplication factor: 2 7 6 5 4 3 2
2. Multiply each digit by its multiplication factor.
Example:
Your number: 1 2 3 4 5 6 7
Multiplication factor: 2 7 6 5 4 3 2
Results after multiplying: 2 14 18 20 20 18 14
3. Add the products from the multiplication.
Example: 2 + 14 + 18 + 20 + 20 + 18 + 14 = 106
4. Divide the sum from step 3 by 11.
Example: 106 divided by 11 is 9 with a remainder of 7.
If the remainder is 0, the self-check digit is 0. If the
remainder is 1, your number does not have a modulus 11 self-check
digit, and you should not use the number in the fields you define
with modulus 11 self-check fields.
5. Subtract the remainder obtained in step 4 from 11 to obtain the
self-check digit.
Example: The remainder from step 4 is 7; 11 minus 7 is 4, which
is the self-check digit.