Why are currency notes numbered? In the United States an average of 37 Million notes are printed every day and each of them has a unique seriel number. Is it really necessary for the government to number them or could they just KNOW how many they printed. I understand if only a few thousand were issued it would be important to know which debts were outstanding, but with billions? When they are finally removed from circulation by the FED do they sort them by issuing FRB to keep a running number on each Banks debts? Is numbering notes done out of tradition or is there a more logical answer?