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Rounding

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Manager
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09 Nov 2009, 09:47
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This one from Manhattan GMAT:

d >= 5 or d >= 4, please explain.
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Senior Manager
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09 Nov 2009, 09:57
for 8.1d5 to get rounded to 8.1

lets see if d=4 , we have 8.145.... which gets rounded to 8.1
if d=5 we have 8.155, its more than 8.15 so will get rounded to 8.2

hence I think answer is d>=5
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09 Nov 2009, 10:40
srini123 wrote:
for 8.1d5 to get rounded to 8.1

lets see if d=4 , we have 8.145.... which gets rounded to 8.1
if d=5 we have 8.155, its more than 8.15 so will get rounded to 8.2

hence I think answer is d>=5

I'd have to agree x>=5
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09 Nov 2009, 13:24
srini123 wrote:
for 8.1d5 to get rounded to 8.1

lets see if d=4 , we have 8.145.... which gets rounded to 8.1 ---> ??? Shouldn't it be 8.2? I think this is where we part ...
if d=5 we have 8.155, its more than 8.15 so will get rounded to 8.2

hence I think answer is d>=5

I know from a statement in Manhattan book that d>=5 but your expln. is not what I expected. I just want to make sure the concept is right.
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09 Nov 2009, 18:30
ezinis wrote:
srini123 wrote:
for 8.1d5 to get rounded to 8.1

lets see if d=4 , we have 8.145.... which gets rounded to 8.1 ---> ??? Shouldn't it be 8.2? I think this is where we part ...
if d=5 we have 8.155, its more than 8.15 so will get rounded to 8.2

hence I think answer is d>=5

I know from a statement in Manhattan book that d>=5 but your expln. is not what I expected. I just want to make sure the concept is right.

I think 8.145 will be rounded to 8.1 not 8.2 (because 14 is closer to 10 not 20, so 14 will be rounded to 10 if we are rounding the units digit, that's how I see Rounding....)
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10 Nov 2009, 19:19
I got this squared away now. 8.145 get rounded to 8, 8.1 or 8.15 but not 8.2. Thank guys for your confirmation.
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11 Nov 2009, 02:25
ROUNDING RULE:

Simplifying a number to a certain place value. 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:
9.1278 rounded to the nearest tenth = 9.1, since the dropped 2 is less than 5.
9.1278 rounded to the nearest hundredth = 9.13, since the dropped 7 is greater than (or equal to) 5.
9.1278 rounded to the nearest thousandth = 9.128, since the dropped 8 is greater than (or equal to) 5.
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Re: Rounding   [#permalink] 11 Nov 2009, 02:25
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