AQA GCSE Computer Science (8525)Specification point 3.3.1

AQA 8525 3.3.1: Number bases

The free BugBot lesson that teach this point, a robot to try it on, and the past-paper questions that test it.

What it covers

We count in denary (base 10): ten digits, and each place is worth ten times the one to its right. Computers count in binary (base 2): two digits, and each place is worth twice the one to its right. Converting between them is a skill every exam tests, and BugBot can play a number to you in binary.

Place values
Binary to denary in Python
Denary to binary
Hear a number

Read the free lesson (15 min)

Or do it in the simulator, with tasks that mark themselves

Lessons that teach it

F8.2 Binary and denary Data representation
Converting 8-bit numbers both ways, and hearing them on the buzzer.

Try it on a robot

The task from F8.2 Binary and denary, running here. Change the program and press Run.

Past paper questions on this

Real exam questions that test this, each worked through with a program you can run.

Edexcel 1CP2 June 2022 Paper 2, Question 4: Rearrange mixed-up lines: binary to denary with a doubling multiplier 15 marks

The specification is AQA's own document; this page says which of our lessons teach point 3.3.1 and is not endorsed by the board.