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09 Apr 2018, 02:43
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D
Be sure to select an answer first to save it in the Error Log before revealing the correct answer (OA)!
Difficulty:
45%
(medium)
Question Stats:
62% (01:19) correct
38%
(01:23)
wrong
based on 517
sessions
History
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Not Attempted Yet
If x = 15.246, what is the product of x rounded to the tens place and x rounded to the nearest tenth?
A. 152
B. 153
C. 300
D. 304
E. 306
A. 152
B. 153
C. 300
D. 304
E. 306
11 Oct 2018, 03:37
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Bookmarks
Kem12
Hi Bunuel, I hope you're having a pleasant day. Could you please clarify if the OA above is correct? Shouldn't 15.246 rounded to the nearest tenth be 15.3 as 6 can round up 4 to 5 and 5 can round up 2 to 3, leaving the nearest tenth as 15.3, or are we just going to ignore all the numbers before 4? Please help my understanding here. Thanks
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Posted from my mobile device
15.246 rounded to the nearest tenth is 15.2. You should take into the account only the first dropped digit. So, rounding is not cumulative.
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.
So, according to the above 8.35y rounded to the nearest tenth will be 8.4 irrespective of the value of y.
For mote on this check the following posts:
Math: Number Theory
Rounding Rules on the GMAT: Slip to the Side and Look for a Five!
3. Fractions, Decimals, Ratios and Proportions
- Theory
GMAT Shortcut: Adding to the Numerator and Denominator
Rounding Rules on the GMAT: Slip to the Side and Look for a Five!
How to Identify Terminating Decimals on the GMAT
Rounding Up Some Official GMAT Questions!
Terminating Decimals in Data Sufficiency on the GMAT
GMAT Quantitative: Ratio and Proportions
Ratios in GMAT Data Sufficiency
Why You Should Convert Fractions to Decimals on the GMAT
Use This Strategy for Fractions and Save Time on GMAT Test Day
Variations On The GMAT - All In One Topic
For more:
ALL YOU NEED FOR QUANT ! ! !
Ultimate GMAT Quantitative Megathread
Hope it helps.
09 Apr 2018, 02:53
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Bunuel
If x = 15.246, what is the product of x rounded to the tens place and x rounded to the nearest tenth?
A. 152
B. 153
C. 300
D. 304
E. 306
A. 152
B. 153
C. 300
D. 304
E. 306
X rounded to tens place is 20. ( X > 15 and we want to round to tens place)
X rounded to the nearest tenth is 15.2 ( 15.246 rounded up)
So 20 * 15.2 = 304
Hence Option (D) is our answer.
Best,
Gladi
