Why do we need fractions?

Last updated: 9 Nov 2008

Now we all remember fractions from school, denominators, numerators, improper, mixed etc. You probably also remember hating them, so why would you want to learn about them for a GMAT test?

If you didn't already know here is the bad news. You are not allowed to use a calculator in the GMAT. That's right, NO CALCULATORS, so it is back to doing calculations by hand.

This is where fractions come into their own. Fractions are quicker and more accurate to manipulate by hand than decimals.

To prove the point lets do an example.

Example

What is 64 x 0.125 ?

Using long multiplication the calculation looks something like this...

64
x 0.125
1.280
6.400
8.000

Try to repeat the calculation yourself.

Although you probably know how to do it, you will find it takes a long time and time is an asset that you cannot afford to waste in the GMAT.

Also, there are many calculations to do and each one of those introduces the possibility of making a mistake. Add a zero here, forget a decimal point there, forget to carry the 2 somewhere else.

Making it easier with fractions

Those of you who are real math whizzes will have spotted that 0.125 is a fraction in disguise.

mathematical expression

We will use this fact to rephrase the question:

What is mathematical expression ?

mathematical expression

A piece of cake! ...if you already knew that mathematical expression

Next page: How do you spot a fraction?

Comments (2):

  1. I need the trial practes for your GMAT
    tutorials

    thanks

    Peter NGabo

    Anonymous on 16 Mar 2007 (permalink)

  2. There are practice fractions questions at the end of this tutorial. Best of luck with them.

    joel on 17 Mar 2007 (permalink)

You must log in or register to add a comment.

Creative Commons License