Method for verifying a credit card number:

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Presentation transcript:

Method for verifying a credit card number: Example: 49927398716

Method for verifying a credit card number: 1. Starting with the second digit from the right, Example: 49927398716 4 9 9 2 7 3 9 8 7 1 6

Method for verifying a credit card number: 1. Starting with the second digit from the right, double every other digit Example: 49927398716 4 9 9 2 7 3 9 8 7 1 6 2 6

Method for verifying a credit card number: 1. Starting with the second digit from the right, double every other digit Example: 49927398716 4 9 9 2 7 3 9 8 7 1 6 16 7 2 6

Method for verifying a credit card number: 1. Starting with the second digit from the right, double every other digit Example: 49927398716 4 9 9 2 7 3 9 8 7 1 6 6 9 16 7 2 6

Method for verifying a credit card number: 1. Starting with the second digit from the right, double every other digit Example: 49927398716 4 9 9 2 7 3 9 8 7 1 6 4 18 9 4 7 6 9 16 7 2 6

Method for verifying a credit card number: 1. Starting with the second digit from the right, double every other digit 2. Break into digits, Example: 49927398716 4 9 9 2 7 3 9 8 7 1 6 4 18 9 4 7 6 9 16 7 2 6 4 1 8 9 4 7 6 9 1 6 7 2 6 = 70

Method for verifying a credit card number: 1. Starting with the second digit from the right, double every other digit 2. Break into digits, and add the digits together Example: 49927398716 4 9 9 2 7 3 9 8 7 1 6 4 18 9 4 7 6 9 16 7 2 6 4 +1+8+ 9 + 4 + 7 + 6 + 9 +1+6+ 7 + 2 + 6 = 70

Method for verifying a credit card number: 1. Starting with the second digit from the right, double every other digit 2. Add all digits together 3. Result must end with 0 (e.g 70) Example: 49927398716 4 9 9 2 7 3 9 8 7 1 6 4 18 9 4 7 6 9 16 7 2 6 4 +1+8+ 9 + 4 + 7 + 6 + 9 +1+6+ 7 + 2 + 6 = 70