Data Representation resources
Computer Science, grade 9. Notes, worksheets, videos, interactive tools and revision materials for this chapter.
Notes
Study notes
The chapter's lessons are the notes — read them in order, then use the resources below.
01Binary NumbersCount in base 2 and convert between binary and denary.Read lesson →02Text and CharactersSee how ASCII and Unicode turn letters into numbers.Read lesson →03Images and PixelsDiscover how grids of coloured dots become photographs.Read lesson →04Sound and SamplingLearn how sound waves are sampled into digital audio.Read lesson →
Worksheets
Practice worksheet
Attempt every question before revealing the answer — that struggle is where learning happens.
Practice questions live inside each lesson — work through them there, then return for revision.
Videos
Watch and learn
Hand-picked searches to find a clear video explanation of each lesson.
Revision
Revision checklist
Can you explain each of these out loud, without looking? If not, re-read that lesson.
- Binary Numbers: Count in base 2 and convert between binary and denary.
- Text and Characters: See how ASCII and Unicode turn letters into numbers.
- Images and Pixels: Discover how grids of coloured dots become photographs.
- Sound and Sampling: Learn how sound waves are sampled into digital audio.
- Read each lesson's summary and re-do its practice questions from memory.