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[CSig] Check Digit and application

[CSig] Check Digit and application

Assessment

Presentation

Computers

9th Grade

Hard

Created by

Andy tsui

Used 6+ times

FREE Resource

8 Slides • 0 Questions

1

[CSig] Check Digit and application

By Andy tsui

2

Objectives

  • Describe check digit

  • The need of check digit

  • Application in ISBN, Barcode and IDs​

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Pair and share

If you need to enter a long string of number, for example, some credit card number, how can you ensure the number entered is correct?

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Check digit

  • An extra digit that is calculated from the previous numbers

  • To "verify" the numbers are inputted correctly

  • Usually check digit is one digit and placed at the end

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Application

  • Commonly found in numbers that serves as Identification, e.g.

    • Macau ID, DSEJ ID etc.

    • Credit card number

    • Barcode

    • ISBN

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ISBN

  • International standard book number

  • An unique "ID" for publication - each edition of book should have assigned an ISBN

  • ISBN have two standards:

    • ISBN-10: 10 digit

    • ISBN-13: 13 digit​

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media
media

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Barcode (for product)

  • The last digit of product barcode is also check digit

  • To avoid error from barcode scanner​

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media

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Group work

Research online, and draw a poster about calculating check digit in:

  1. Barcode (EAN​-13)

  2. ISBN-10

  3. ISBN-13

  4. ​Credit Card (MOD 10)

​Explain the calculating by using examples, step-by-step instruction or flowchart

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[CSig] Check Digit and application

By Andy tsui

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