Maths topics, explained with pictures
Each topic opens the way it does in the app: the big ideas, a picture of each, the words to know and a worked example.
Numbers
How numbers are built, and what happens when you put them together.
Shapes and angles
Sorting shapes by their sides, and measuring the turn at a corner.
Fractions
Numbers for the pieces of a whole, not just for whole things.
Time and units
Reading a clock, and swapping between units like metres and centimetres.
Data and graphs
Reading numbers off a chart, and finding the middle of a set of numbers.
Chance
How likely something is, from impossible to certain.
Money
Adding up what you spend, and working out the change you get back.
Sequences
Lists of numbers that follow a rule, and finding what comes next — or far ahead.
Area and perimeter
How much space a shape covers, and how far it is around the edge.
Pictures of numbers
Reading a number off a picture — a bar, a circle, a number line.
Decimals
Another way to write the pieces of a whole, using a dot.
Percentages
Parts of a whole, always counted out of a hundred.
Ratios
Comparing two amounts by how many times one fits the other.
Algebra
Using a letter to stand for a number you do not know yet.
Coordinate geometry
Doing geometry with numbers, by giving every point an address.
Trigonometry
Linking the angles of a right triangle to the lengths of its sides.
Calculus
Measuring how fast something is changing at one exact moment.
Counting arrangements
Counting how many ways something can be arranged or chosen.
Vectors
A quantity with both a size and a direction.
Sets
A set is just a collection of things, and you can ask what two of them share.
Complex numbers
Numbers that need two directions to write down, not just one.
Matrix algebra
A block of numbers you can add and multiply as one object.
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