There are many reasons why the used of credit cards nowadays are so popular. Aside from the fact that it is very convenient knowing that you don’t have to carry a big amount of money in your wallet instead you just have to present the card, credit cards also perform a big role when shopping online. However, make sure that you can identify the fake credit cards from the real ones knowing that it is possible to obtain free credit card numbers.

**Guide to Identify a Fake Credit Card**

If you are managing a store, for sure it would be necessary that you have an idea on how to identify real credit card numbers. Remember that free credit card numbers are widely available online so if you don’t want to become a victim, then you should educate yourself about how to spot a fake credit card number. This is when you should learn more about the Luhn check digit algorithm. This is a mathematical test wherein you will have to manipulate the number or follow an equation to check if the result is divisible with 10.

For a credit card with even number digits, you have to double the alternating numbers by starting with the first digit. On the other hand, for cards with odd number digits, you have to start with the second digit. If ever that the sum is a double digit number, you need to add the numbers to get a single digit result. After that, you have to go back to the real credit card number and change the doubled digits with the new number, then add them together. Once you get the sum, you will have to check if it is divisible with 10. If ever that the number is not divisible with 10, then it only means that the number is not valid.

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