HistorianBook.com project of numbers.

Comments about barcode:

47738829#Barcode of Cigarettes MARLBORO Gold Original.
Visitor #1
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.
Visitor #1