Math 108 Topics in Mathematics | Laura Barnes |
16.1 Check Digits Universal Product Code - UPC - Video

16.1 Check Digits Universal Product Code - UPC - Video

Key Idea

The Universal Product Code (UPC) is a twelve-digit code,
a_{1}a_{2}a_{3}a_{4}a_{5}a_{6}a_{7}a_{8}a_{9}a_{10}a_{11}a_{12}, including a
check digit at the end. By multiplying each digit by its weight, (alternately 1 for even positions, 3 for odd positions and then adding), the sum must be a number ending in 0.