E-Math: What is Direct Proportion and Inverse Proportion?

Proportion is a topic taught in Secondary 1 and 2. In fact, we have learnt about direct proportion much younger.


A real simple example of Direct Proportion would be the more money I have, the more things I can buy. When amount of money increases, the number things I can buy increase too. (Notice the increase in both things)

Another example, the less I eat, the thinner I become, so as the amount of food eaten decreases, my weight decreases too.


An example of inverse proportion most of you can relate to would be: the more time I spent on Facebook (PSP, WII, Internet), the less time I have on my books!

Allow me to add in another example of Inverse Proportion, the more I spent, the less I have in my bank.

These are some examples (simple) to understand the true meaning of Direct or Inverse proportion.

In the next post, I will be sharing with you how we can translate a statement into an equation involving proportion. I'm also going to highlight the 'tricky' proportion question in 2008 GCE O Level Elementary Mathematics Paper 1.

Related Posts:

Hi, I'm Ai Ling Ong. I enjoy coaching students who have challenges with understanding and scoring in 'O' Level A-Maths and E-Maths. I develop Math strategies, sometimes ridiculous ideas to help students in understanding abstract concepts the fast and memorable way. I write this blog to share with you the stuff I teach in my class, the common mistakes my students made, the 'way' to think, analyze... If you have found this blog post useful, please share it with your friends. I will really appreciate it! :)

10 Responses to E-Math: What is Direct Proportion and Inverse Proportion?
  1. [...] You need to first understand what’s Direct Proportion (Read all about it here) [...]

  2. Shahzaib
    February 17, 2010 | 9:49 pm

    WOW!!!!!! My whole confusion is finished. Thanks Dude!


  3. JudyKimBerry
    December 11, 2010 | 3:17 pm



  4. JOMAR
    July 24, 2011 | 8:55 pm

    thanks! :)


  5. star
    January 14, 2012 | 11:34 pm

    where r the coaching classes.


  6. usama
    February 8, 2012 | 5:10 pm

    thanks, i knew all these things but confusion is always with me when i am solving these questions.....


    shubham singh Reply:

    thanks now i can get full marks in my activity.thank u very much dude


  7. m.sathma
    November 6, 2012 | 2:30 am

    i can understand but still it is confusing for me



  8. m.sathma
    November 30, 2012 | 7:17 pm

    Because of this teaching I got full marks in my test

    !!! Thank You For Teaching Me !!!


  9. m.sathma
    November 30, 2012 | 7:52 pm



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