Another method of calculating a check digit

The eight digit ID number being used in this example is broken down as follows:

XXXXXXX

X

7 digits unique identification

1 digit self check digit

The first seven digits are all that are required to identify a record on the file. The eighth digit is included to reduce the possibility of entering the wrong identification/account number.

The self check digit: The self check digit is calculated from the first seven digits as follows:

    1. The 1st, 3rd, 5th and 7th digits are multiplied by 1
    2. The 2nd, 4th, 6th digits are multiplied by 2
    3. The resulting digits are added (this means if the answer from the multiplication is a 2 digit number, both digits are added)
    4. The sum is subtracted from 100
    5. The last digit of the difference becomes the check digit

EXAMPLES:

The seven digit identification/account number is: 4175036

4

1

7

5

0

3

6

x1

x2

x1

x2

x1

x2

x1

4

2

7

10

1

6

6

The identification/account number is 41750364

The seven digit identification/account number is: 4711924

4

7

1

1

9

2

4

x1

x2

x1

x2

x1

x2

x1

4

14

1

2

9

4

4

The identification/account number is : 47119241