47738829#Barcode of Cigarettes MARLBORO Gold Original.

11her's something really interesting about 11.
Something that you see in your daily life. Grab a book.
Behind the book, you'll see a bar code. Just above the barcode, you'll see ISBN along with 13 or 10 numbers printed on it.
Now, we're gonna take the 10 digit barcode">#barcode.
Multiply the last digit(leftmost) by 10, the next digit by 9 then the next by 8 and so on until you multiply the rightmost number by 1.
Now add the ten numbers you got.
Here, 0x10+1x9+9x8+…+8x1
You'll get a multiple of 11.
Here I got 231 which equals 21x11.
For all barcodes with 10 digits, the sum of the products of the digits and their corresponding positon values will be a multiple of 11. This is used so that won't be any errors in entering the bar code to a computer or another device.