Purpose

This number is the identification number of the bank. The last digit of this routing number is a check digit. The check digit for routing number is calculated using a more complicated formula than the one we used for UPCs. The new “formula” is: 7. d1 + 3. d2 + 9. d3 + 7. d4 + 3. d5 + 9. d6 + 7. d7 + 3. d8 + 9. d9 ≡ 0 mod 10. This method ... ................
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