GCSE – Data representations
Resources
This unit allows learners to gain the understanding and skills required for the data representation sections of the GCSE computer science exam. First, learners look at binary and hexadecimal numbering systems, how they work, and how to convert between bases. Then, learners explore different coding systems and find out how text, images, and sound are represented in computers. All lessons include worksheets to allow learners to explore each topic through practical application.
Unit guide
Updated: 10 Feb 2023
Learning graph
Updated: 21 Feb 2023
Learning graph
Updated: 21 Feb 2023
Learning graph
Updated: 21 Feb 2023
Summative assessment
Updated: 10 Feb 2023
Summative assessment
Updated: 10 Feb 2023
Lessons
Lesson 1
What is representation?
Lesson 2
Number bases
Lesson 3
Binary addition
Lesson 4
Binary subtraction
Lesson 5
Binary shifts
Lesson 6
Signed binary integers
Lesson 7
Hexadecimal
Lesson 8
Representing text
Lesson 9
Unicode and file size calculation
Lesson 10
Representing bitmap images
Lesson 11
Bitmap file size calculation
Lesson 12
Representing sound
Lesson 13
Sound file size calculation
Lesson 14
Measurements of storage
Lesson 15
Lossy and lossless compression
Lesson 16
Run length encoding
Lesson 17
Huffman coding
Lesson 18
Summative assessment
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