**Step one**

Take the credit card number below and double every other digit from the left (**marked in raised numbers below**). (I got this number off an ad on the internet).

**5**424 1801 2345 6789

5x2=10; 2x2=4; 1x2=2; 0x2=0; 2x2=4; 4x2=8; 6x2=12; 8x2=16.

(You should come up with the following sequence of numbers: 10, 4, 2, 0, 4, 8, 12, and 16.)

**Step two**

Add the new numbers (10, 4, 2, 0, 4, 8, 12, and 16) to the numbers you didn't double (4, 4, 8, 1, 3, 5, 7 and 9) in the above card number.

All double digits (like 10, 12 and 16) should be added as a sum of their digits. An example would be: 10 becomes 1+0; 12 becomes 1+2 and 16 becomes 1+6).

1+0+4+4+4 + 1+8+0+1 + 4+3+8+5 + 1+2+7+1+6+9 = 69

**Step three**

69 10 = 6.9

As you can see, the number I got off the ad is a fake or invalid number. Grab a credit card out of your wallet and try this simple and fun test.

Source

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