1. Method for verifying a credit card number: Example: 49927398716

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

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

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

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

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

7. Method for verifying a credit card number: 1. Starting with the second digit from the right, double every other digit 2. Break into digits, 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 Example: 49927398716

8. 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 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 Example: 49927398716

9. 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 3. Result must end with 0 (e.g 70) 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 Example: 49927398716