### GCSE Maths Revision: Formulae

#### 4th April 2017

GCSE Mathematics - New Syllabus Content

Key facts to know about formula and how to change the subject in a formula - Revising made easy

You need to understand what a formula is and what it does. This will come up across all your different subject areas for your GCSE Maths exam - geometry and measures, probability, algebra, statistics and much more. So let’s take a look at the key things you need to know!

• A formula shows the relationship between a number of different variables.

• A variable is an unknown entity - represented by a letter such as ‘a’ or ‘b’.

• It is used for a specific purpose - such as finding the area of a rectangle. The formula for this is: A = l x w (area = length x width).

• The most useful thing about formulae is that you can rearrange the order of the variables to change the focus/subject of it and therefore find the answer to something else. So if we want to find the length instead of the area we swap the equation around giving us -  l = A/w length = area / width)

For more information on formulas, their uses and how you change the subject, have a listen to our GCSE song on formulas which can be found here. To find out more about formulas for triangles and quadrilaterals, take a look at our other GCSE revision subjects - there are loads to help you!

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