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This is the 6th video in a series of worked solutions designed to help students revising for GCSE Computer Science Paper 1.

Past paper used in this video:

The paper is based on (but not the same as) the Edexcel Paper 1 for June 2018.

For more information click here:

This video includes the answers to Question 2b and introduces Question 2c

Learning objectives:
3.1.2: understand how computers represent and manipulate numbers (unsigned integers, signed integers (sign and magnitude, two’s complement))

3.1.3: be able to convert between binary and denary whole numbers (0–255)

3.3.3: understand how a lossless, run-length encoding (RLE) algorithm works

3.4.2: understand how a Caesar cipher algorithm works

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