How does Luhn’s algorithm know when your fingers fumble? Every digit in a credit card number contributes a one-digit number to the final sum in the algorithm.

Researchers in the math world argue that algorithms are a useful tool to help students learn math, but need to be coupled with a focus on conceptual understanding.

How does Luhn’s algorithm know when your fingers fumble? Every digit in a credit card number contributes a one-digit number to the final sum in the algorithm.