Data representation revision

This visually appealing knowledge organiser helps pupils revise binary, denary, hexadecimal, binary addition, binary shift, ASCII, Unicode, bitmaps, sound and data compression for the GCSE in Computer Science. Written originally for OCR Computer Science (J276), it is also suitable for helping pupils revise for other exam boards.

One PDF document contains a 2-page PDF knowledge organiser and another PDF document which includes tips of revision techniques allowing pupils to pick a technique they prefer. Once they have revised the topic, they can attempt the 4 mark exam practise question on the second sheet and mark it themselves using the mark scheme included.

This resource makes an ideal homework task, can be used as part of a lesson or given to pupils to help them with their exam revision.


  • Data units
  • Converting denary whole number to binary
  • Add binary numbers
  • Use binary shifts
  • Convert binary into hexadecimal numbers
  • The use of check digits
  • Representing characters
  • Character sets
  • Representing images in pixels
  • Metadata
  • Colour depth
  • Resolution
  • Calculating the size of an image
  • Sound sampling
  • Sample size
  • Bit rate
  • Lossy and lossless compression

For a high-quality PDF student workbook on algorithms that includes detailed theory, tasks and the answers visit

Check out these other great revision knowledge organisers by Nichola Wilkin (nwilkin):


Save for later
  • Data-Representation-Revision-TASKS.pdf
  • Revision-Overview.pdf

About this resource


Created: Mar 12, 2019

Updated: Apr 23, 2019


zip, 556 KB



pdf, 185 KB



pdf, 160 KB


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