Check Digit (IGCS)

Check Digit (IGCS)

Read the following article about ISBN

https://www.isbn-international.org/content/what-isbn

Multiple Select

How many digits are there in ISBN?

• 10

• 11

• 12

• 13

Multiple Choice

Is ISBN an unique code?

• No

• Yes, it is unique for every copy of the book

• Yes it is unique for every book title

So what is check digit?

• A digit that is calculated from all the other digits in the code

• Usually the last digit in a code

• Checks the data entry caused by mis-typing or mis-scanning (barcode)

• Check digits are usually find in barcodes, ISBN, credit card and ID card numbers