1. Keeper 8:
UPC Codes
S.A.S. #12 1 – 3
Credit Cards S.A.S. #

2. Keeper 8:
UPC Codes
S.A.S. #12 1 – 3
Credit Cards S.A.S. #

3. What is it?
A UPC is a 12 digit code generally used to identify a product.
Can also be used as coupons
Why use a UPC instead of just a price tag?
Can change price in computer easily
Universal PRODUCT Code not Universal PRICE code
If you decided to change the price of an item you would have to but new bar codes on everything!

4. Parts of the code The 12 digits are broken up into the following
Manufacturer Number (6 digits)
A company(manufacturer) is assigned a specific code that is used for all of their products
Product Number (5)
A number specific to a single product the manufacturer sells
Check Digit (1)
The check digit is determined by the values of the manufacturer and product numbers

6. How is a code valid?
The purpose of a check digit is to guard against input errors or fraud. Follow these steps:
Underline the odd positions, add them up.
Multiply by 3
Add the even positions up
Add the two together
The sum must end in a 0 to be valid

7. 1.) Show that 0-58200-48826-5 is a valid UPC number.
2.) Show that is a invalid UPC number.
Valid = 0
Invalid = 2

8. 3.) Determine the check digit (d) for the UPC number 38137009213d.

9. 50,000,000,000,000 Credit Cards

10. Rule:
2 x (Odd spots) + # of Odd spots > 4 + (Even Spots) =
2.) VISA: d
d = 3

11. 3.) What is the check digit (d) for the MASTER CARD number?
4.) Show that is an invalid Visa credit card number.
d = 3
NOT VALID

12. ARE YOU READY??
1.) Is the following UPC numbers valid codes  
2.) Find the check digit (d) for the UPC numbers d
3.) Is the following Credit Card number valid?  
4.) Find the check digit (d) for the Credit Card number d