Bespoke, fully editable lesson for Cambridge International AS & A Level Computer Science (9618): P1.10 Compression. Slides, worksheet and full answers.

Written for Paper 1 Theory Fundamentals, section 1 Information representation (syllabus 1.3.1, 1.3.2, 1.3.3). Everything is editable, so you can adapt it to your class.

What’s included

• PowerPoint lesson (14 slides) with teacher notes on every slide
• Student worksheet (Word), ready to print or edit
• Answer sheet (Word) with mark-scheme style answers for every question

P1.10 Compression

By the end of the lesson students can:

• Explain why files are compressed, with real examples
• Compare lossy and lossless compression and justify the choice for a situation
• Describe how text, bitmap, vector and sound files are compressed, including run-length encoding

Worksheet sections: A. Key words; B. Run-length encoding; C. Choose the method; D. Exam-style questions; E. Challenge

Every lesson includes

• Learning goals and a starter question
• Clear explanations, diagrams and worked examples (Cambridge pseudocode, as in the 2027–2029 pseudocode guide, with Python alongside)
• A quick check and a “your turn” task linked to the worksheet
• Exam-style questions with marks, and an exit ticket

Format

• PowerPoint (.pptx) and Word (.docx), fully editable
• Works in PowerPoint and Google Slides
• Calm, muted sixth-form design, consistent across the whole course

These are independent resources written for the Cambridge International AS & A Level Computer Science syllabus (9618) for examination in 2027, 2028 and 2029. They are not produced or endorsed by Cambridge University Press & Assessment. Syllabus point numbers are our own numbering of the syllabus statements.