MOD 7 Check Digit - The check digit is the last or ninth number of the PRO number. The first eight numbers are in sequence. The check digit, or ninth number, will be 0 through 6, and will never exceed 6. | Example: XXX-XXXXXC C = Check digit |
The check digit is determined or verified by dividing the first eight digits by seven. The remainder of this division is the check digit. | Examples: |
The following table shows the check digit of each decimal remainder when dividing by seven: | |
Check Digit | Remainder |
zero | none |
1 | .14 |
2 | 28 or .29 |
3 | .42 or .43 |
4 | .57 |
5 | .71 |
6 | .85 or .86 |
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