Syllabus Edition

First teaching 2021

Last exams 2024

|

Ordering FDP (CIE IGCSE Maths: Extended)

Revision Note

Test yourself
Mark

Author

Mark

Last updated

Ordering FDP

How do I put fractions in order of size?

  • If comparing only fractions, write them over a lowest common denominator
    • For 3 over 5 comma 1 half comma fraction numerator 13 space over denominator 20 end fraction comma 7 over 12, the lowest common denominator of 5, 2, 20 and 12 is 60 so change them to 36 over 60 comma 30 over 60 comma 39 over 60 comma 35 over 60 then order them by their numerators
      • From smallest to largest: 30 over 60 comma 35 over 60 comma 36 over 60 comma 39 over 60 so 1 half comma 7 over 12 comma 3 over 5 comma 13 over 20

 

How do I put fractions, decimals and percentages in order of size?

  • If comparing a mixture of fractions, decimals and percentages, change everything into decimals

Order by Size Notes fig5 (1)

Order by Size Notes fig5 (2)

Order by Size Notes fig5 (3)

Examiner Tip

A calculator can be used to quickly convert any quantities into decimals

You've read 0 of your 10 free revision notes

Unlock more, it's free!

Join the 100,000+ Students that ❤️ Save My Exams

the (exam) results speak for themselves:

Did this page help you?

Mark

Author: Mark

Expertise: Maths

Mark graduated twice from the University of Oxford: once in 2009 with a First in Mathematics, then again in 2013 with a PhD (DPhil) in Mathematics. He has had nine successful years as a secondary school teacher, specialising in A-Level Further Maths and running extension classes for Oxbridge Maths applicants. Alongside his teaching, he has written five internal textbooks, introduced new spiralling school curriculums and trained other Maths teachers through outreach programmes.