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Computer Science · May / June 2026 · Paper 11 · Question 3

0478

As printed in the paper

The question as text

Hexadecimal and binary are two examples of a number system.

Read automatically from the paper; the printed page above is exact.

Show the answer and mark scheme

  • 3(a)[1]

    One from:

    Denary // decimal
    Two’s complement

  • 3(b)[1]

    0010 1010

  • 3(c)[1]

    0001 0000 0001

  • 3(d)[1]

    71

  • 3(e)[1]

    2D8

  • 3(f)[4]

    One mark for each correct nibble (MAX 2)

    One mark for the three correct carries as working

    One mark for one overflow bit

    For example:

    1 1 1

    1 0 0 1 1 1 0 1

    1 1 1 1 0 0 0 0

    1 1 0 0 0 1 1 0 1

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