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Rounding rules ?!

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by .maxime. » Fri Feb 29, 2008 9:12 am
Hi everyone,

In one of the questions of the Official Guide, I noticed the following:

... Cindy drove her car 290 miles, rounded to the nearest 10 miles ...

According to me, this means she has driven between 285 en 294 miles. In the book, I quote: "Since the miles are rounded to the nearest 10 miles, they can range anywhere from 284 miles to 295 miles."
Rounding 284 to the nearest 10 miles is 280, rounding 295 makes 300 ?!

In the same question, same issue:

... Cindy used 12 gallons of gasoline, rounded to the nearest gallon ...
I quote from the answer: "Since the gallons are rounded to the nearest gallon, they can range anywhere from 11.4 gallons to 12.5 gallons."

Are rounding rules different in the US than they are in Europe? :shock:
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Re: Rounding rules ?!

by Stuart@KaplanGMAT » Fri Feb 29, 2008 8:01 pm
.maxime. wrote:Hi everyone,

In one of the questions of the Official Guide, I noticed the following:

... Cindy drove her car 290 miles, rounded to the nearest 10 miles ...

According to me, this means she has driven between 285 en 294 miles. In the book, I quote: "Since the miles are rounded to the nearest 10 miles, they can range anywhere from 284 miles to 295 miles."
Rounding 284 to the nearest 10 miles is 280, rounding 295 makes 300 ?!

In the same question, same issue:

... Cindy used 12 gallons of gasoline, rounded to the nearest gallon ...
I quote from the answer: "Since the gallons are rounded to the nearest gallon, they can range anywhere from 11.4 gallons to 12.5 gallons."

Are rounding rules different in the US than they are in Europe? :shock:
Rounding rules should be the exact same.

.5 rounds up, .4 rounds down.

So, 11.5 to 12.4 gallons would round to 12; 285 to 294 miles would round to 290.
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by .maxime. » Sat Mar 01, 2008 6:02 am
That's what I thought too... So the book must be wrong.
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Re: Rounding rules ?!

by mysticfireball » Fri Jul 18, 2008 12:58 pm
Stuart Kovinsky wrote:
.maxime. wrote:Hi everyone,

In one of the questions of the Official Guide, I noticed the following:

... Cindy drove her car 290 miles, rounded to the nearest 10 miles ...

According to me, this means she has driven between 285 en 294 miles. In the book, I quote: "Since the miles are rounded to the nearest 10 miles, they can range anywhere from 284 miles to 295 miles."
Rounding 284 to the nearest 10 miles is 280, rounding 295 makes 300 ?!

In the same question, same issue:

... Cindy used 12 gallons of gasoline, rounded to the nearest gallon ...
I quote from the answer: "Since the gallons are rounded to the nearest gallon, they can range anywhere from 11.4 gallons to 12.5 gallons."

Are rounding rules different in the US than they are in Europe? :shock:
Rounding rules should be the exact same.

.5 rounds up, .4 rounds down.

So, 11.5 to 12.4 gallons would round to 12; 285 to 294 miles would round to 290.
So why is the answer

D.) 284/12.5 and 295/11.4

Why does 284 round up to 290 and 12.5 round down to 12?
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by Wanbro » Fri Jul 18, 2008 9:18 pm
Entirely agree with the above posts.

This surely has to be an error in the book... right!?
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by ruwan_s » Thu May 14, 2015 9:33 am
I noticed this in the book as well, I suppose you could pick answer D based on the fact they don't have any solution other than miles that is a multiple of 5.

I have another question,

What is 1.99 rounded to the nearest tenth? Is it 2.0?
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by Brent@GMATPrepNow » Thu May 14, 2015 9:36 am
ruwan_s wrote: What is 1.99 rounded to the nearest tenth? Is it 2.0?
The two nearest tenths are 1.9 and 2.0
Since 1.99 is closer to 2.0 than it is to 1.9, we can say that that 1.99 rounded to the nearest tenth is 2.0

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by [email protected] » Thu May 14, 2015 9:40 am
Hi ruwan_s,

You are correct. Since the hundredths digit of 1.99 is 9, we would use that to round the tenths digit UP.

Thus, 1.99 rounded to the nearest tenth is 2.0

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by ruwan_s » Thu May 14, 2015 10:07 am
Thank you Brent and Rich!
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