How to Read 12 Digit UPC Barcodes - WikiHow

"Most barcodes in the US are 12-digit UPC barcodes, with ten digits at the bottom of the code and one small number to each side. Impress your friends by asking them to select a random item from the kitchen with a removable label and cut the numbers off of the UPC barcode; you can then proceed to read the numbers encoded in the lines."