Steps to validating UPC's: 1. Add the digits in the odd-numbered positions 2. Multiply this total by 3 3. Next add the digits in the even-numbered positions to this total (not including the check digit) 4. Divide this total by 10. What is the remainder? 5. 10 - Remainder = check digit (Note if the Rem=0, then the check digit is 0) Is this a valid UPC? Is this a valid UPC? 7 2527273070 6 0 20357 12 268 2 Is this a valid UPC? Is this barcode number valid? 2-93847 || 65674-8 01988 142214 Validating UPC Codes Find the check digit. Find the check digit. 3-02468 || 13579- d 4-13579 || 02468-d Steps to validating UPC's: 1. Add the digits in the odd-numbered positions 2. Multiply this total by 3 3. Next add the digits in the even-numbered positions to this total (not including the check digit) 4. Divide this total by 10. What is the remainder? 5. 10 - Remainder = check digit (Note if the Rem=0, then the check digit is 0) Is this a valid UPC? Is this a valid UPC? 7 2527273070 6 0 20357 12 268 2 Is this a valid UPC? Is this barcode number valid? 2-93847 || 65674-8 01988 142214 Validating UPC Codes Find the check digit. Find the check digit. 3-02468 || 13579- d 4-13579 || 02468-d