This student workbook is ideal for students, non-specialist teachers, NQTs any anyone who wants to learn more about data representation to gain confidence in the OCR GCSE (9-1) in Computer Science (J276) “2.6 Data representation” specification. Can be used in the classroom as a teaching aid, for self-study or as a revision tool.


This 58-page PDF which covers the theory and includes ready-to-use tasks and even includes the answers.


Table of Contents:

  • Units
  • Amount of storage space required
  • Numbers
  • Denary (base 10)
  • Binary (base 2)
  • Convert from binary to denary
  • Convert from denary to binary
  • Add binary numbers
  • Binary Shifts
  • Hexadecimal (base 16)
  • Why is hexadecimal used?
  • Convert from binary to hexadecimal
  • Convert hexadecimal to binary
  • Convert hexadecimal to denary
  • Convert from denary to hexadecimal
  • Number base notation
  • Check Digits
  • Characters
  • Binary codes to represent characters
  • Character Set
  • ASCII, extended ASCII and Unicode
  • Images
  • Pixels
  • Colour Depth
  • Metadata
  • Calculating file size
  • Converting binary into a bitmap
  • Sound
  • How sound can be sampled and stored in a digital form
  • Sample frequency / sample rate
  • Bit rate / Resolution
  • Calculate sound file sizes
  • Compression
  • Lossless
  • Lossy

OCR Data Representation Workbook

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