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hello this is presto Walker your credit card number probably looks pretty random to you but hidden inside those digits is a secret mathematical code in this video Ill teach you a magic trick based on the pattern youll need a credit card a debit card or an ATM card that has 16 digits you also want some pencil and paper to do some simple calculations for this video Im going to do the calculation for the number thats written on the screen but you should follow along with your own credit card number to get started focus on the 16 digits in the number and separate them into two groups for the first step add up every other digit in this case the digits which are colored in black will add up 1 3 5 7 8 0 0 and 0 to get to a sum of 24 well go ahead and double this result 24 times 2 is 48 now look at the numbers which youve just added up count the number of digits which are 5 or larger in this case the numbers 5 7 8 are 5 or larger so that means there are three numbers which are 5 or larg
