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Cambridge IGCSE Computer Science practice

Paper 1 structured question: Methods of error detection

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Attempt questionMethods of error detection revisionRevise the key idea

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Methods of error detection

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Paper 1Computer Systems3 marks

Check digits play a crucial role in data validation.

Description

Check Digit Functionality

Check digits are used in identifiers like ISBNs and barcodes to detect errors in data entry. They are calculated from the other digits and appended to the end of the number.

  1. a

    Explain How do check digits help in identifying errors in data entry?

    Aim for approximately 3 distinct marking points.

    [3]

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Paper 1 structured question: Methods of error detection

Paper 1Computer Systems1 marks

Description

Check Digit Example

A check digit is calculated from the other digits in a number and is used to verify the accuracy of data entries. For example, in an ISBN, the last digit is a check digit that helps identify errors in the preceding digits.

  1. a

    State What is the purpose of a check digit?

    Aim for approximately 1 distinct marking point.

    [1]