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Help with decimals.....

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abhishekc11
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Help with decimals..... [#permalink] New post   19 Jul 2016, 23:16
So this is one of the questions from princton reveiw's drills on decimals.

Question:divide 19.6 by 3.22(rounded to the nearest hundred)

What am i supposed to do in this question?


The answer they have given is 6.09
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mejia401
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Re: Help with decimals..... [#permalink] New post   20 Jul 2016, 07:29
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How are other answer choices? If they are far off then estimating should be fine. If they are close together, then you should know that it's about more than 18/ more than 3 is round 6 times.


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Re: Help with decimals..... [#permalink] New post   25 Jul 2016, 15:51
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On the GMAT, you'll pretty much always be able to estimate on a question like this.

If, for some reason, you need to get an exact answer, here's what you do:

1. 'Shift the decimals': 19.6/3.22 is the same thing as 196/32.2, which is the same thing as 1960/322. (Note that I had to add a zero to the 196 to multiply it by 10 a second time, since I ran out of decimals to get rid of!)

2. Do long division using those two numbers, until you have the precision you need.
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Re: Help with decimals..... [#permalink] New post   25 Jul 2016, 22:13
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abhishekc11 wrote:
So this is one of the questions from princton reveiw's drills on decimals.

Question:divide 19.6 by 3.22(rounded to the nearest hundred)

What am i supposed to do in this question?


The answer they have given is 6.09


For GMAT, all you need to observe here is that this will be less than 20/3 = 6.67 i.e. it will be about 6.
You approximate 19.6 to 20 and 3.22 to 3 but remember that the overall value will be less than what you obtain by dividing 20 by 3.

I assume that the drill's only purpose is to help you practice how to calculate with decimals. For example, you might need to do something like this in GMAT:
700/3.5
You should be able to arrive at 200 here by multiplying and dividing the fraction by 10.
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Re: Help with decimals..... [#permalink] New post   26 Jul 2016, 11:10
1960/322 = 980/160 = 98/16 = 6.something (def less than 0.5)
You'll never have close values in GMAT


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Re: Help with decimals..... [#permalink]
26 Jul 2016, 11:10
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Bunuel
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