You use your credit card on a regular basis to make purchases. While most people know that the numbers on the card are unique identifiers, most of us have no idea what they actually mean. Credit card ...

All mainstream credit card numbers obey a mathematical trick designed to catch the most common typos. It’s called the Luhn algorithm, named after IBM researcher Hans Peter Luhn, who patented it in ...

Kelly-Ann Franklin has spent more than two decades in journalism which has helped her build a wide knowledge base of business and personal finance topics. Her goal with editing is to ensure tough ...

You’re at the checkout screen after an online shopping spree, ready to enter your credit card number. You type it in and instantly see a red error message ...

Here’s a fun trick to entertain friends and win bar bets: Guess the first number on somebody’s credit card tucked away in their wallet. You can do that because credit card numbers aren’t random. Using ...

Most of us are curious beings by nature. So, if you've been staying awake at night wondering what your 16-digit credit card number means, it's your lucky day. I'm going to pull back the curtain and ...

Most of us are curious beings by nature. So, if you’ve been staying awake at night wondering what your credit card number means, it’s your lucky day. I’m going to pull back the curtain and show you ...