IGCSEMathsCambridge (CIE)CoreRevision NotesNumberIntroduction to FractionsFractions of Amounts

Fractions of Amounts (Cambridge (CIE) IGCSE Maths): Revision Note

Exam code: 0580 & 0980

Naomi C

Written by: Naomi C

Reviewed by: Dan Finlay

Updated on

Cambridge (CIE) Maths: CoreEdexcel Maths A: FoundationCambridge (CIE) International Maths: Core

Fractions of Amounts

How do I find a fraction of an amount?

  • Method 1
    Divide by the denominator and multiply by the numerator

    • To find 1 third of 90, divide it by 3

      • 90 divided by 3 equals 30

    • To find 2 over 5 of 60, divide it by 5 then multiply it by 2

      • 60 divided by 5 equals 12, then 12 cross times 2 equals 24

  • Method 2
    Change the fraction into a decimal, then multiply

    • To find 1 fourth of 16, turn 1 fourth into 0.25 then multiply

      •  0.25 cross times 16 equals 4

    • To find 9 over 10 of 15, turn 9 over 10 into 0.9 then multiply

      •  0.9 cross times 15 equals 13.5

  • Method 3
    Write both numbers as fractions and multiply two fractions together

    • To find 2 over 3 of 60, write 60 as 60 over 1

      • work out 2 over 3 cross times 60 over 1 equals 120 over 3 equals 40

    • To find 5 over 6 of 8 over 3

      • work out 5 over 6 cross times 8 over 3 equals 40 over 18 equals 20 over 9

👀 You've read 1 of your 5 free revision notes this week
An illustration of students holding their exam resultsUnlock more revision notes. It's free!

By signing up you agree to our Terms and Privacy Policy.

Already have an account? Log in

Test yourself

Did this page help you?

Previous:Introduction to FractionsNext:Equivalent & Simplified Fractions
Author
Reviewer
Naomi C

Author: Naomi C

Expertise: Maths Content Creator

Naomi graduated from Durham University in 2007 with a Masters degree in Civil Engineering. She has taught Mathematics in the UK, Malaysia and Switzerland covering GCSE, IGCSE, A-Level and IB. She particularly enjoys applying Mathematics to real life and endeavours to bring creativity to the content she creates.

Dan Finlay

Reviewer: Dan Finlay

Expertise: Maths Subject Lead

Dan graduated from the University of Oxford with a First class degree in mathematics. As well as teaching maths for over 8 years, Dan has marked a range of exams for Edexcel, tutored students and taught A Level Accounting. Dan has a keen interest in statistics and probability and their real-life applications.

Download notes on Fractions of Amounts