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:

What is the result when X is rounded to the nearest [#permalink]

Show Tags

18 Jun 2008, 23:39

1

This post received KUDOS

This topic is locked. If you want to discuss this question please re-post it in the respective forum.

What is the result when X is rounded to the nearest hundredth?

1) When X is rounded to the nearest thousand the result would be 0.455 2) The thousandth digit of X is 5

1: When X is rounded to the nearest thousand the result would be 0.455. So when X is rounded to the nearest hundredth it should be 0.45: Sufficient 2: Not sufficient

But OA is Both 1 & 2

Can some one explain the logic here? Thanks!
_________________

There are several rounding rules but after reading your examples i had to check the book for the rule that GMAT employs. Here is the rule: To round off a decimal ,look at the digit to the right of the digits place you are rounding to.If that number is 0-4 ,then there is no change.If that number is 5-9 then round up.

bsd_lover wrote:

Consider decimals .4549 and .4551 - both satisfy A. But when rounded to nearest 100, they would be .45 and .46 hence A by itself is INSUFFICIENT.

A along with B says the decimal will be rounded to .46 to the nearest hundredth.

There are several rounding rules but after reading your examples i had to check the book for the rule that GMAT employs. Here is the rule: To round off a decimal ,look at the digit to the right of the digits place you are rounding to.If that number is 0-4 ,then there is no change.If that number is 5-9 then round up.

bsd_lover wrote:

Consider decimals .4549 and .4551 - both satisfy A. But when rounded to nearest 100, they would be .45 and .46 hence A by itself is INSUFFICIENT.

A along with B says the decimal will be rounded to .46 to the nearest hundredth.

we already know the 1000th digit..its 5..we rounded it up..right..the number is x=0.455<- thousandth digit..

so shouldnt this round up to 0.45<- 100th digit?

bsd_lover wrote:

Good so C is confirmed as the answer then.

maximusdecimus wrote:

There are several rounding rules but after reading your examples i had to check the book for the rule that GMAT employs. Here is the rule: To round off a decimal ,look at the digit to the right of the digits place you are rounding to.If that number is 0-4 ,then there is no change.If that number is 5-9 then round up.

bsd_lover wrote:

Consider decimals .4549 and .4551 - both satisfy A. But when rounded to nearest 100, they would be .45 and .46 hence A by itself is INSUFFICIENT.

A along with B says the decimal will be rounded to .46 to the nearest hundredth.

fresinha consider my examples : .4549 rounded to 2 digits = .45 but rounded to 3 digits its .455 .4551 rounded to 2 digits = .46 but rounded to 3 digits its .455

fresinha12 wrote:

I am lost on this one..

we already know the 1000th digit..its 5..we rounded it up..right..the number is x=0.455<- thousandth digit..

you might be mixing up statement 1 & 2. Statement 2 doesnt tell you anything regarding the number, it only tells you that the thousandths digit is 5, but the hundreths digit could be anything......

What is the result when X is rounded to the nearest hundredth?

1) When X is rounded to the nearest thousand the result would be 0.455 2) The thousandth digit of X is 5

1: When X is rounded to the nearest thousand the result would be 0.455. So when X is rounded to the nearest hundredth it should be 0.45: Sufficient 2: Not sufficient

But OA is Both 1 & 2

Can some one explain the logic here? Thanks!

My answer is c. a.Statement 1 is insufficient. because the number can be .4549 or .4554 so x rounded to hundredths digit can not be determined b. statement 2 is insufficient, If the thousandth digit is 5, then definetely the hundredths digit is rounded up, but the hundredths digit is not given (can be .1235 therefore hundredhts is 4 ; or .2345 therefore hundredths is 5) Put together, statements are sufficient

There are several rounding rules but after reading your examples i had to check the book for the rule that GMAT employs. Here is the rule: To round off a decimal ,look at the digit to the right of the digits place you are rounding to.If that number is 0-4 ,then there is no change.If that number is 5-9 then round up.

bsd_lover wrote:

Consider decimals .4549 and .4551 - both satisfy A. But when rounded to nearest 100, they would be .45 and .46 hence A by itself is INSUFFICIENT.

A along with B says the decimal will be rounded to .46 to the nearest hundredth.

this is surprising to see that in GMAT has its own rule for rounding. We always perform rounding from extreme right toward left till the place we want to round. So once we know that rounding till 1000th place is .455, for finding rounded digit till 100th place it doesn't matter what was there on 10000th place and beyond that.