What is a check digit?
Unit 1- Credit Card/UPC Code Validity

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Mathematics
•
11th - 12th Grade
•
Hard
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1.
FLASHCARD QUESTION
Front
Back
A check digit is a form of redundancy check used for error detection on identification numbers, such as UPC codes and credit card numbers.
2.
FLASHCARD QUESTION
Front
How is the check digit calculated for a UPC code?
Back
The check digit for a UPC code is calculated using a specific algorithm that involves summing the digits in certain positions and applying a modulus operation.
3.
FLASHCARD QUESTION
Front
What is the purpose of a check digit in a credit card number?
Back
The purpose of a check digit in a credit card number is to verify that the number has been entered correctly and to help detect errors.
4.
FLASHCARD QUESTION
Front
What does a valid UPC code look like?
Back
A valid UPC code consists of 12 digits, typically formatted as 0-12345-67890-1, where the last digit is the check digit.
5.
FLASHCARD QUESTION
Front
What is the significance of the last digit in a credit card number?
Back
The last digit in a credit card number is the check digit, which is used to validate the entire number.
6.
FLASHCARD QUESTION
Front
How can you verify if a credit card number is valid?
Back
You can verify if a credit card number is valid by using the Luhn algorithm, which checks the check digit against the rest of the number.
7.
FLASHCARD QUESTION
Front
What is the Luhn algorithm?
Back
The Luhn algorithm is a simple checksum formula used to validate a variety of identification numbers, including credit card numbers.
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