Revision notes, activities, lesson plans, teaching ideas, and other resources for GCSE, A-Level, and IB Computer Science teachers and students.
Boolean logic worksheet pack
These three Boolean logic worksheets have exam style questions on logic sta...
Edexcel Computer Science (9-1)
by Ann Weidmann et al
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Dijkstra's algorithm video
This video is probably the best explanation of Dijkstra's algorithm for IB ...
Input-Process-Output (IPO) Model
The Input-Process-Output model is a simple topic but some students sometime...
A comprehensive review of hexadecimal. The video covers not only how to u...
Subprograms, Local Variables & Structured Programming
Subprograms are known by several different names - methods, functions, proc...
Utility Software and Models
Some students find the difference between operating system software and ut...
This video explains different types of data structures - 1 dimensional ar...
Operating System (OS) - GCSE Computer Science
A detailed overview of operating systems, starting with the general tasks t...
Click here for recommended AQA A-Level Computer Science textbooks.
This video contains lots of examples of converting binary numbers to decimal numbers, and vice versa. A good revision guide.
Unsigned binary arithmetic
Binary Addition & Overflow
Another excellent video from ComputerPhile with their usual clear explanations and worked examples. This video recaps binary numbers and then explains how to perform binary addition. It also deals with the potential problem of overflow and how it can be handled.
Signed binary using two’s complement
Why we use Two's Complement
This video explains how to represent negative numbers in binary. It explains why we can't use a simple sign bit to represent positive or negative numbers, and then looks at how one's complement solves this problem. Finally it explained how two's complement works and why it is used. Although the beginning of the video goes into a lot of detail, it is useful to understand exactly why two's complement is needed and used.
Numbers with a fractional part
A-Level appendix unit - PG Online
Floating point numbers, adders, D-type flip flops are covered in this free lesson resource unit from PG Online. The presentations and activities are designed for the AQA AS and A-Level courses, but the content is relevant to other A-Level courses too.
A-Level only content
Absolute and relative errors
Normalisation of floating point form