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want to see my credit card number itamp;#39;s first come first serve so are you ready to screenshot all right here it is just kidding itamp;#39;s no oneamp;#39;s credit card number but how do I know this letamp;#39;s find out all valid credit card numbers have this property where we start at the rightmost digit and double every second digit like this then we are going to add all of the digits not numbers digits so here we would do 8 + 8 + 2 + 5 + 1 + 6 + 8 + 4 + 1 and so forth now when we do this method with valid credit card numbers we will always get a sum thatamp;#39;s a multiple of 10 but since we got a sum of 68 we know that this is not a valid credit card number so if youamp;#39;re ever paranoid that you typed your credit card number incorrectly on a computer and algorithm like this will let you know if somethingamp;#39;s wrong