How to calculate the check digit on a barcode | Mathspig Blog
Check Digit Calculator
GitHub - hampus-nilsson/gs1-checkdigit: Javascript function used to generate SSCC, GSIN, GTIN-8, GTIN-12, GTIN-13 & GTIN-14 check digit.
Amazon.com : Large 14-Digit LCD Display Desktop Calculator with Check & Correct Function, Solar Battery Dual Power Calculator, Large Computer Keys Electronics Calculator for Office School Calculating : Office Products
Solved Part B: Calculate the missing check digit in ISBN | Chegg.com