AQA 7517 4.5.2.1: Number base
The free BugBot lessons that teach this point, a robot to try it on, and the past-paper questions that test it.
What it covers
At GCSE you converted between binary, denary and hexadecimal and met the units from bits to petabytes. At A level the same ideas come with exact vocabulary: which set a number belongs to, what a base really is, and the difference between a kilobyte and a kibibyte. Examiners mark these words precisely, so this lesson pins them down.
- Number sets
- Counting and measurement
- Number bases
- Bits, bytes and units
Or do it in the simulator, with tasks that mark themselves
Lessons that teach it
- A7.1 Number sets, bases and units Data representation
Natural, integer, rational, irrational, real and ordinal numbers; any number base; bits, bytes, kilo and kibi. - A7.2 Binary arithmetic and signed integers Data representation
Unsigned addition and multiplication, sign and magnitude, two's complement, subtraction and overflow.
Try it on a robot
The task from A7.1 Number sets, bases and units, running here. Change the program and press Run.
The specification is AQA's own document; this page says which of our lessons teach point 4.5.2.1 and is not endorsed by the board.