# GCSE Maths

## Formulae

What are formulae? A formula must have an equals sign and will have one or more unknowns that can take ...

What is the quadratic formula? Despite being a useful skill, it does take quite a bit of time to factorise ...

## The difference of two squares

What is the difference of two squares? When we have an equation which contains only two parts it is often ...

## Constructing regular polygons

Different regular polygons can be made from circles by equally dividing them into the correct number of segments. To do ...

## Fractional powers

Rules of fractional powers Instead of always having a whole number that is a power we may sometimes have one ...

## Interquartile range and semi-interquartile range

Interquartile range The names of these two ranges do sound rather complicated but really they are quite straightforward and are ...

## Median and quartiles

What is a median? The median is the middle number found when the list is ordered. Using a cumulative frequency ...

## Scatter graphs

All about scatter graphs Scatter graphs are used to plot two different outcomes against each other. This allows us to ...

## Line graphs

All about line graphs A line graph is a type of graph used mainly to show a difference of something ...

## Tangent properties

A tangent is something which we have already looked at and involves a straight line which just touches a curve ...

## Circle sectors

Finding the area of a circle sector To find the space taken up by a circle sector we just need ...

## More trigonometry rules

We will now move away from using trigonometry only with right-angled triangles and instead look at how we can find ...

## Types of samples

Selecting samples When we decide who to ask questions to in a survey there are several ways for us to ...

## Pie charts

All about Pie Charts A pie chart is used to represent data that can be separated into segments. This means ...

## Histograms

What is a Histogram? A histogram is basically a type of bar graph that will immediately tell us the spreadĀ of ...