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# Quick Division to get three decimal place precision

Author Message
Intern
Joined: 27 May 2012
Posts: 9
GMAT Date: 05-17-2012
Quick Division to get three decimal place precision [#permalink]

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09 Jul 2012, 03:49
Hi all,

In most of the PS questions I am able to solve in the fractional format. But takes time to convert that fractional part into decimal.
For example, 26/27 is approximated to 0.963

Please suggest ways to get the decimal solution in a very little time.

Thanks,
FKA
Intern
Joined: 27 Apr 2012
Posts: 10
Location: India
Concentration: General Management, Organizational Behavior
GMAT Date: 11-21-2012
WE: Consulting (Consulting)
Re: Quick Division to get three decimal place precision [#permalink]

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09 Jul 2012, 04:17
One way is that u can learn values of fraction till 20. i.e.1/1=1; 1/2=0.5, 1/3= 0.33,1/4=0.25; 1/5=0.20, 1/6=0.1666, 1/7=0.1428, 1/8=0.125, 1/9=0.111, 1/10=0.10, 1/11=0.0909,1/12=0.083, 1/13=0.0769, 1/14=0.0714, 1/15=0.06666, 1/16=0.0625,1/17=0.0588, 1/18=0.0555, 1/19=0.0526, 1/20 = 0.05...

Now convert your fraction it this form.
26/27= 26* 1/9 * 1/3 = 26*0.33*0.11; I consider multiplication always easier than division; Also use approximation to eliminate other choices...

25% 0.25 1/4
331/3% 0.333... 1/3
50% 0.5 1/2
75% 0.75 3/4
80% 0.8 4/5
Manager
Status: Juggg..Jugggg Go!
Joined: 11 May 2012
Posts: 243
Location: India
GC Meter: A.W.E.S.O.M.E
Concentration: Entrepreneurship, General Management
GMAT 1: 620 Q46 V30
GMAT 2: 720 Q50 V38
Re: Quick Division to get three decimal place precision [#permalink]

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09 Jul 2012, 04:21
Depends on what you are looking for. For the above example, you could say it is .9 just by looking at it and also you can tell its closer to 1 THAN .9. This level is more than sufficient to crack GMAT questions.
GMAT doesn't really need intense calculations. An approximate value is more than enough.

Even in IR Section, most of the questions can be done without a calculator
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Re: Quick Division to get three decimal place precision   [#permalink] 09 Jul 2012, 04:21
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# Quick Division to get three decimal place precision

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