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A-LevelComputer ScienceData representation9618/12 · Oct/Nov 2022 · Q25 Marks

Convert the two's complement binary integer into denary. 10010110

  1. (a)(i)Convert the two's complement binary integer into denary. 10010110[1]
  2. (a)(ii)Convert the unsigned binary integer into hexadecimal. 10010110[1]
  3. (a)(iii)Convert the unsigned binary integer into Binary Coded Decimal (BCD). Show your working. 10010101[2]
  4. (b)Perform the following binary addition. 10001100 + 01000110[1]

Mark scheme

Marking points from the official mark scheme (Oct/Nov 2022). The mark or mark type is shown in brackets.

  1. [1] -106
  2. [1] 96
  3. [1] 149 decimal
  4. [1] 0001 0100 1001
  5. [1] 1101 0010

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About this question

Topic
Data representation, A-Level Computer Science (syllabus 9618). Structured question, 5 marks.
Source
A-Level Computer Science, Oct/Nov 2022 Paper 1 Variant 2, question 2.

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