# That Blue Square Thing

## AQA Computer Science GCSE

July 2019: the AQA CompSci area is almost complete. Most of the content for units 3-6 is now up and there's quite a lot of Unit 7 material. There's still some work to do, particularly on Paper 1 units, but it's getting there.

### Boolean Logic Intro (Year 9)

Boolean Logic is just using Boolean expressions to work out True and False statements. The problem is that it can become a bit tricky.

Boolean Logic Basics - slides I use in class

Boolean Logic - an introduction to the ideas behind Boolean logic and how it might be used

Boolean Logic and Truth Tables - the use of compound Boolean expressions complicates things

### Year 11 Boolean Logic - circuits and cool stuff

Truth Tables Return - some revision of the basics

Truth Table Checker - what operators does what?

Then there are logic circuit symbols, which make questions a bit more complex but aren't actually all that hard. Once you've had a go and figured out how it works.

Logic Symbols - slides I use in class

The tricky bit is figuring out what the diagram is showing each time.

3 Logic Circuit Diagrams - diagrams to think through

3 Diagrams - a single page for printing

### Drawing Logic Diagrams

Then you need to be able to construct a diagram from a description...

Drawing logic circuits - demo slides from class

Drawing Circuits - Exercise 1 - these are the same questions from the slides

Drawing Circuits - Exercise 2 - more questions

Drawing Circuits - Exercise 3 - yet more (and harder) questions

There are blank diagrams here if you need to print them:

### Using Gate Diagrams

Sometimes you'll be given a diagram with unknown gates and a logical statement and asked to work out which gate goes where. This can be a bit tricky.

Gate diagrams - demo slides from class