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KS3 Data Representation – Learn Guide

Course Content

1. Why computers use binary 3 Topics

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1.1 Switches and binary

1.2 All data becomes binary

1.3 Practice: binary

2. Data units 3 Topics

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2.1 From bits to petabytes

2.2 Powers and conversions

2.3 Practice: data units

3. Binary and denary 3 Topics

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3.1 Two number systems

3.3 Practice: binary and denary

4. Binary addition and overflow 3 Topics

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4.1 Rules of binary addition

4.2 8-bit addition and overflow

4.3 Practice: binary addition

5. Hexadecimal 3 Topics

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5.1 What is hex?

5.2 Converting hex

5.3 Practice: colour detective

6. ASCII and Unicode 3 Topics

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6.1 Character sets

6.2 Using ASCII

6.3 Practice: ASCII or Unicode?

7. Images 3 Topics

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7.1 Pixels and colour depth

7.3 Practice: quality vs file size

8. Binary shifts 3 Topics

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8.1 Left and right shifts

8.2 Loss of precision

8.3 Practice: binary shifts

9. Sound 3 Topics

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9.1 Analogue to digital

9.2 Sample rate and bit depth

9.3 Practice: sound

10. Compression 3 Topics

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10.1 Lossy and lossless

10.2 Run-length encoding

10.3 Practice: which compression?

11. Calculating file size 3 Topics

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11.1 The three formulas

11.2 Calculate it

11.3 Practice: memory card challenge

12. Bringing it together 2 Topics

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12.1 Mixed retrieval

12.2 Exam practice

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