Quick Division to get three decimal place precision

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Quick Division to get three decimal place precision [#permalink]

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

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Re: Quick Division to get three decimal place precision [#permalink]

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

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Re: Quick Division to get three decimal place precision [#permalink]

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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Quick Division to get three decimal place precision

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