That Blue Square Thing

AQA Computer Science GCSE

This page is up to date for the AQA 8525 syllabus for exams from 2022.

Data Representation – Binary Maths

You need to be able to add together binary numbers and use binary shifts. Neither of these are too tricky, but you need to work on them.

Binary Addition

You need to be able to add together up to three binary numbers.

PDF iconBinary Addition – how to do it

Questions to work through:

PDF iconMore Binary Addition Questions – questions to try in class

And some exam style questions:

PDF iconExam Style Binary Addition Questions (answers)

Binary Shifts

Binary shifts can be used to multiply and divide by factors of 2. The way questions are asked on them can be quite tricky at times.

PDF iconBinary Shifts – slides from class

PDF iconBinary Shifts – summary - a summary of how shifts work

PDF iconBinary Shift Examples – to stick in

Here's a copy of some stuff I wrote on the board in class:

Key points about binary shifts

There are some exam questions:

PDF iconBinary Shift exam questions – slides

PDF iconBinary Shift exam questions – printable (answers)