Thank you for using the timer - this advanced tool can estimate your performance and suggest more practice questions. We have subscribed you to Daily Prep Questions via email.
Customized for You
we will pick new questions that match your level based on your Timer History
Track Your Progress
every week, we’ll send you an estimated GMAT score based on your performance
Practice Pays
we will pick new questions that match your level based on your Timer History
Not interested in getting valuable practice questions and articles delivered to your email? No problem, unsubscribe here.
It appears that you are browsing the GMAT Club forum unregistered!
Signing up is free, quick, and confidential.
Join other 500,000 members and get the full benefits of GMAT Club
Registration gives you:
Tests
Take 11 tests and quizzes from GMAT Club and leading GMAT prep companies such as Manhattan GMAT,
Knewton, and others. All are free for GMAT Club members.
Applicant Stats
View detailed applicant stats such as GPA, GMAT score, work experience, location, application
status, and more
Books/Downloads
Download thousands of study notes,
question collections, GMAT Club’s
Grammar and Math books.
All are free!
Thank you for using the timer!
We noticed you are actually not timing your practice. Click the START button first next time you use the timer.
There are many benefits to timing your practice, including:
In the decimal, 2.4d7, d represents a digit from 0-9. If [#permalink]
09 Dec 2010, 21:01
1
This post was BOOKMARKED
00:00
A
B
C
D
E
Difficulty:
(N/A)
Question Stats:
100% (01:21) correct
0% (00:00) wrong based on 7 sessions
In the decimal, 2.4d7, d represents a digit from 0-9. If the value of the decimal rounded to the nearest tenth is less than 2.5, what are the possible values of d?
Hi ppl..I always get confused about rounding the digit Questions in PS..
Can some one explain me the above Q
Thanks in advance
Last edited by Bunuel on 09 Feb 2012, 06:29, edited 1 time in total.
Re: Rounding numbers [#permalink]
09 Dec 2010, 22:24
krishireddy wrote:
Hi ppl..I always get confused about rounding the digit Questions in PS..
Can some one explain me the below Q
In the decimal, 2.4d7, d represents a digit from 0-9. If the value of the decimal rounded to the nearest tenth is less than 2.5, what are the possible values of d?
Thanks in advance
REMEBER: In XYZ.abc Z - Units digit y - tens x - hundreds
a - Tenths b - hundredths c - thousandths
ROUNDING concept
Important: THE ROUNDING SHUD TAKE PLACE FROM RIGHT TO LEFT
if the above # is getting rounded to Thenth (a), then the value of "a" depends on the value of "b" (the hundredths place) in the below way.
\(a ==> a+1 , if b>=5\) \(a ==> a , if b<5\)
Original qtn
given # is \(2.4d7\) (as per the above concept, the tenths place value depends upon the value in hundredths place i.e. d)
and as given the resultant # is < 2.5 ==> 2.4 (after rounding to tehnths) so for the 4 (in the tenths place) not to be changed d has to be < 5 ==> d has to be < 5 ==> posiible values for d are \(0,1,2,3, and 4\)
Regards, Murali Kudos?
Last edited by muralimba on 09 Dec 2010, 23:11, edited 1 time in total.
Re: Rounding numbers [#permalink]
09 Dec 2010, 23:37
3
This post received KUDOS
Expert's post
krishireddy wrote:
Hi ppl..I always get confused about rounding the digit Questions in PS..
Can some one explain me the below Q
In the decimal, 2.4d7, d represents a digit from 0-9. If the value of the decimal rounded to the nearest tenth is less than 2.5, what are the possible values of d?
Thanks in advance
Rounding rules
Rounding is simplifying a number to a certain place value. To round the decimal drop the extra decimal places, and if the first dropped digit is 5 or greater, round up the last digit that you keep. If the first dropped digit is 4 or smaller, round down (keep the same) the last digit that you keep.
Example: 5.3485 rounded to the nearest tenth = 5.3, since the dropped 4 is less than 5. 5.3485 rounded to the nearest hundredth = 5.35, since the dropped 8 is greater than 5. 5.3485 rounded to the nearest thousandth = 5.349, since the dropped 5 is equal to 5.
BACK TO THE ORIGINAL QUESTION: In the decimal, 2.4d7, d represents a digit from 0-9. If the value of the decimal rounded to the nearest tenth is less than 2.5, what are the possible values of d?
So, in order 2.4d7 rounded to the nearest tenth to be less than 2.5, d must be less than 5: 0, 1, 2, 3, or 4. In this case 2.4d7 rounded to the nearest tenth will be 2.4 which is less than 2.5.
Re: Rounding numbers [#permalink]
10 Dec 2010, 08:02
Thanks for the explanations Muralimba,mypatpat and Bunnel…
I was under the impression that if d = 4 then
2.447 rounded to nearest tenth is (I was coming from right most digit rounding each preceding digit) 2.45 (since 7>5) 2.5 (since 5=5)
Hence I thght d=4 is also an invalid option…
But now I understand that whenever a digit is rounded we should consider only the digit to the right of our digit .We shall not be worrying about the rest of the digits.
Re: Rounding numbers [#permalink]
17 Jan 2011, 03:54
Bunuel,I disagree with u .in case 4372.25 rounded tenth digit(decimal). in these type of problems we have 2 case 1-If the preceding digit(2) is odd and hundred digit is equal to 5. then we increase tenth digit by 1. and n.m. become 4372.3 2-If the preceding digit is even ( in this case),then we left the n.m. unchanged and n.m. become 4372.2 hope you got my point
Re: Rounding numbers [#permalink]
17 Jan 2011, 05:21
Expert's post
rojans wrote:
Bunuel,I disagree with u .in case 4372.25 rounded tenth digit(decimal). in these type of problems we have 2 case 1-If the preceding digit(2) is odd and hundred digit is equal to 5. then we increase tenth digit by 1. and n.m. become 4372.3 2-If the preceding digit is even ( in this case),then we left the n.m. unchanged and n.m. become 4372.2 hope you got my point
The above is not correct for GMAT. Anyway number x.25 rounded to the nearest tenth is x.3.
Again, check rounding rules:
Rounding is simplifying a number to a certain place value. To round the decimal drop the extra decimal places, and if the first dropped digit is 5 or greater, round up the last digit that you keep. If the first dropped digit is 4 or smaller, round down (keep the same) the last digit that you keep.
Example: 5.3485 rounded to the nearest tenth = 5.3, since the dropped 4 is less than 5. 5.3485 rounded to the nearest hundredth = 5.35, since the dropped 8 is greater than 5. 5.3485 rounded to the nearest thousandth = 5.349, since the dropped 5 is equal to 5.
BACK TO THE ORIGINAL QUESTION: In the decimal, 2.4d7, d represents a digit from 0-9. If the value of the decimal rounded to the nearest tenth is less than 2.5, what are the possible values of d?
So, in order 2.4d7 rounded to the nearest tenth to be less than 2.5, d must be less than 5: 0, 1, 2, 3, or 4. In this case 2.4d7 rounded to the nearest tenth will be 2.4 which is less than 2.5.
Re: Rounding numbers [#permalink]
17 Jan 2011, 08:17
I am saying 4327.254 ----will be 4327.2 in tenth decimal place. and 4327.354 will be 4327.4 in tenth decimal place value will depend what is coming before 5.It's true. I agree with you.Except in this case. usually -above 5 we increase the n.m.by 1 in decimal digit and below 5 we unchanged the digit. such as 4327.567--- 4327.6 and 4327.435---4327.4 in rounding tenth in decimal digit
Re: Rounding numbers [#permalink]
17 Jan 2011, 08:33
Expert's post
rojans wrote:
I am saying 4327.254 ----will be 4327.2 in tenth decimal place. and 4327.354 will be 4327.4 in tenth decimal place value will depend what is coming before 5.It's true. I agree with you.Except in this case. usually -above 5 we increase the n.m.by 1 in decimal digit and below 5 we unchanged the digit. such as 4327.567--- 4327.6 and 4327.435---4327.4 in rounding tenth in decimal digit
Please read carefully:
For GMAT if the first dropped digit is 5 or more you ROUND UP the last digit that you keep and if the first dropped digit is less than 5 you KEEP THE SAME the last digit that you keep.
4327.254 rounded to the nearest tenth will be 4327.3 since the dropped 5 is equal to 5; 4327.354 rounded to the nearest tenth will be 4327.4 since the dropped 5 is equal to 5. _________________
Re: Rounding numbers [#permalink]
17 Jan 2011, 18:13
Same here...I was thinking exactly the same...thanks for the explanation
krishireddy wrote:
Thanks for the explanations Muralimba,mypatpat and Bunnel…
I was under the impression that if d = 4 then
2.447 rounded to nearest tenth is (I was coming from right most digit rounding each preceding digit) 2.45 (since 7>5) 2.5 (since 5=5)
Hence I thght d=4 is also an invalid option…
But now I understand that whenever a digit is rounded we should consider only the digit to the right of our digit .We shall not be worrying about the rest of the digits.
Re: Rounding numbers [#permalink]
22 Jan 2011, 05:38
Bunuel wrote:
For GMAT if the first dropped digit is 5 or more you ROUND UP the last digit that you keep and if the first dropped digit is less than 5 you KEEP THE SAME the last digit that you keep..
Hi Bunuel, where did you get the statement above ? OG10, 11, or 12? I am trying to look for it. Here is what I found from a math website, please read Rule Three carefully:
Rule One. Determine what your rounding digit is and look to the right side of it. If the digit is 0, 1, 2, 3, or 4 do not change the rounding digit. All digits that are on the right hand side of the requested rounding digit will become 0.
Rule Two. Determine what your rounding digit is and look to the right of it. If the digit is 5, 6, 7, 8, or 9, your rounding digit rounds up by one number. All digits that are on the right hand side of the requested rounding digit will become 0.
Rounding with decimals: When rounding numbers involving decimals, there are 2 rules to remember:
Rule One Determine what your rounding digit is and look to the right side of it. If that digit is 4, 3, 2, or 1, simply drop all digits to the right of it.
Rule Two Determine what your rounding digit is and look to the right side of it. If that digit is 5, 6, 7, 8, or 9 add one to the rounding digit and drop all digits to the right of it.
Rule Three: Some teachers prefer this method:
This rule provides more accuracy and is sometimes referred to as the 'Banker's Rule'. When the first digit dropped is 5 and there are no digits following or the digits following are zeros, make the preceding digit even (i.e. round off to the nearest even digit). E.g., 2.315 and 2.325 are both 2.32 when rounded off to the nearest hundredth. Note: The rationale for the third rule is that approximately half of the time the number will be rounded up and the other half of the time it will be rounded down.
Re: Rounding numbers [#permalink]
22 Jan 2011, 07:59
Expert's post
ezinis wrote:
Bunuel wrote:
For GMAT if the first dropped digit is 5 or more you ROUND UP the last digit that you keep and if the first dropped digit is less than 5 you KEEP THE SAME the last digit that you keep..
Hi Bunuel, where did you get the statement above ? OG10, 11, or 12? I am trying to look for it. Here is what I found from a math website, please read Rule Three carefully:
Rule One. Determine what your rounding digit is and look to the right side of it. If the digit is 0, 1, 2, 3, or 4 do not change the rounding digit. All digits that are on the right hand side of the requested rounding digit will become 0.
Rule Two. Determine what your rounding digit is and look to the right of it. If the digit is 5, 6, 7, 8, or 9, your rounding digit rounds up by one number. All digits that are on the right hand side of the requested rounding digit will become 0.
Rounding with decimals: When rounding numbers involving decimals, there are 2 rules to remember:
Rule One Determine what your rounding digit is and look to the right side of it. If that digit is 4, 3, 2, or 1, simply drop all digits to the right of it.
Rule Two Determine what your rounding digit is and look to the right side of it. If that digit is 5, 6, 7, 8, or 9 add one to the rounding digit and drop all digits to the right of it.
Rule Three: Some teachers prefer this method:
This rule provides more accuracy and is sometimes referred to as the 'Banker's Rule'. When the first digit dropped is 5 and there are no digits following or the digits following are zeros, make the preceding digit even (i.e. round off to the nearest even digit). E.g., 2.315 and 2.325 are both 2.32 when rounded off to the nearest hundredth. Note: The rationale for the third rule is that approximately half of the time the number will be rounded up and the other half of the time it will be rounded down.
The part in red is correct.
And again: For GMAT if the first dropped digit is 5 or more you ROUND UP the last digit that you keep and if the first dropped digit is less than 5 you KEEP THE SAME the last digit that you keep.
Re: Rounding numbers [#permalink]
23 Jan 2011, 14:30
2
This post received KUDOS
Expert's post
Banker's rounding (Round half to even) is one of them many tie breaking rules that can be used in case of .5 They are Round half to odd, Round up, Round down, Round towards 0, Round away from 0 etc etc etc (Check http://en.wikipedia.org/wiki/Rounding for explanation of each method.)
As Bunuel mentioned, GMAT uses Round Up by default. (Inferred from the solution they provided for OG12, Data Sufficiency, Q64, Page 309... When d is rounded to the nearest tenth, the result is 0.5. The value of d could range from 0.45 to 0.54. 0.45 is made 0.5 i.e. rounding up is used, not banker's rounding)
Note: Banker's rounding is more accurate since it doesn't have the upward bias but we have to use what GMAT uses. _________________
Re: In the decimal, 2.4d7, d represents a digit from 0-9. If [#permalink]
19 Feb 2014, 04:24
Hello from the GMAT Club BumpBot!
Thanks to another GMAT Club member, I have just discovered this valuable topic, yet it had no discussion for over a year. I am now bumping it up - doing my job. I think you may find it valuable (esp those replies with Kudos).
Want to see all other topics I dig out? Follow me (click follow button on profile). You will receive a summary of all topics I bump in your profile area as well as via email. _________________
Re: In the decimal, 2.4d7, d represents a digit from 0-9. If [#permalink]
05 May 2015, 11:55
Hello from the GMAT Club BumpBot!
Thanks to another GMAT Club member, I have just discovered this valuable topic, yet it had no discussion for over a year. I am now bumping it up - doing my job. I think you may find it valuable (esp those replies with Kudos).
Want to see all other topics I dig out? Follow me (click follow button on profile). You will receive a summary of all topics I bump in your profile area as well as via email. _________________
The “3 golden nuggets” of MBA admission process With ten years of experience helping prospective students with MBA admissions and career progression, I will be writing this blog through...
You know what’s worse than getting a ding at one of your dreams schools . Yes its getting that horrid wait-listed email . This limbo is frustrating as hell . Somewhere...