CHECK DIGIT ALGORITHM The approved NUBAN format ABC-DEFGHIJKL-M where ABC is the 3-digit bank code assigned by the CBN DEFGHIJKL is the NUBAN Account serial number M is the NUBAN Check Digit, required for account number validation We hereby recommend the following as the Check Digit Algorithm Step 1. Calculate A*3+B*7+C*3+D*3+E*7+F*3+G*3+H*7+I*3+J*3+K*7+L*3 Step 2. Calculate Modulo … Continue reading