Basic Fractions (Cambridge (CIE) IGCSE International Maths)
Revision Note
Written by: Naomi C
Reviewed by: Dan Finlay
Basic Fractions
What is a fraction?
A fraction is part of a whole
A fraction is written as where a and b are integers
The number on the top, a, is called the numerator
The number on the bottom, b, is called the denominator
The values of the numerator and denominator tell us about the size of the fraction
The denominator is how many parts the whole is split into
The numerator is how many parts you have
For example, means that the whole is divided into 3 parts and you have 2 of these parts
How do I find a fraction of an amount?
Method 1
Divide by the denominator and multiply by the numeratorTo find of , divide it by 5 then multiply it by 2
, then
Method 2
Change the fraction into a decimal, then multiplyTo find of , turn into then multiply
Method 3
Write both numbers as fractions and multiply the two fractions togetherTo find of , turn into
Work out
What are equivalent fractions?
Equivalent fractions are two fractions that represent the same amount
They are different ways of writing the same thing
For example, and are equivalent fractions
How do I find an equivalent fraction?
To find an equivalent fraction, multiply the top and bottom of a fraction by the same number
is equivalent to and and etc.
For each fraction, there are an infinite number of equivalent fractions
What is a simplified fraction?
A simplified fraction is a fraction that is written using the smallest possible integer values
Simplifying turns a fraction into an 'easier' equivalent fraction
If both the numerator and denominator can be divided by the same number (called a common factor), the fraction can be simplified
Simplifying is also called cancelling a fraction
How do I simplify fractions?
To simplify the fraction, divide the top and bottom by the common factor
Examiner Tips and Tricks
Make use of your calculator in your exam
Type any fraction into it and pressing equals will automatically simplify the fraction for you
If the question asks you to show your working, you must show which number you divided by
Last updated:
You've read 0 of your 10 free revision notes
Unlock more, it's free!
Did this page help you?