A book's barcode may look like a bunch of random digits, but there is a secret mathematical code hidden in the barcode, which you can even use to perform a little magic trick to predict the last digit.

Secret code in credit cards
https://youtu.be/jSKNBtn1pUc

Source
https://en.wikipedia.org/wiki/....International_Standa

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"The Best Mental Math Tricks" teaches how you can look like a math genius by solving problems in your head (rated 4.8/5 stars on 5 reviews)
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"Multiply Numbers By Drawing Lines" This book is a reference guide for my video that has over 1 million views on a geometric method to multiply numbers. (rated 4.3/5 stars on 6 reviews)
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