GMAT Question of the Day - Daily to your Mailbox; hard ones only

 It is currently 25 Sep 2018, 10:27

### GMAT Club Daily Prep

#### 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

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

# How many odd numbers between 10 and 1,000 are the squares of integers?

Author Message
Senior Manager
Joined: 20 Feb 2006
Posts: 367
How many odd numbers between 10 and 1,000 are the squares of integers?  [#permalink]

### Show Tags

14 Sep 2006, 09:20
3
19
00:00

Difficulty:

45% (medium)

Question Stats:

68% (00:46) correct 32% (00:55) wrong based on 393 sessions

### HideShow timer Statistics

How many odd numbers between 10 and 1,000 are the squares of integers?

A. 12
B. 13
C. 14
D. 15
E. 16

OPEN DISCUSSION OF THIS QUESTION IS HERE: how-many-odd-numbers-between-10-and-175184.html
Senior Manager
Joined: 14 Jul 2006
Posts: 309
Re: How many odd numbers between 10 and 1,000 are the squares of integers?  [#permalink]

### Show Tags

14 Sep 2006, 10:42
2
It is the number of odd integers between 4 and 31,inclusive.
_________________

A well-balanced person is one who has a drink in each of his hands.

SVP
Joined: 24 Aug 2006
Posts: 2092
Re: How many odd numbers between 10 and 1,000 are the squares of integers?  [#permalink]

### Show Tags

14 Sep 2006, 12:14
sangarelli wrote:
It is the number of odd integers between 4 and 31,inclusive.

For the slower people like myself:

odd=odd x odd

odd can never equal odd x even
Senior Manager
Joined: 20 Feb 2006
Posts: 367
Re: How many odd numbers between 10 and 1,000 are the squares of integers?  [#permalink]

### Show Tags

14 Sep 2006, 14:09
Thanks guys. Think I'm having a slow day
VP
Joined: 02 Jun 2006
Posts: 1227
Re: How many odd numbers between 10 and 1,000 are the squares of integers?  [#permalink]

### Show Tags

15 Sep 2006, 08:46
5
6
You can look at it this way...

Max. number < 1000 which is a perfect square : 961 (31 x 31)

# of off numbers = (31-1)/2 +1
= 16

As 1, 3 are odd but their squares < 10, answer = 16-2 = 14.
Math Expert
Joined: 02 Sep 2009
Posts: 49496
Re: How many odd numbers between 10 and 1,000 are the squares of integers?  [#permalink]

### Show Tags

01 Jun 2015, 01:42
3
5
How many odd numbers between 10 and 1,000 are the squares of integers?

A. 12
B. 13
C. 14
D. 15
E. 16

The square of an odd number is an odd number:

10 < odd < 1,000
10 < odd^2 < 1,000
3.something < odd < 31.something (by taking the square root).

So, that odd number could be any odd number from 5 to 31, inclusive: 5, 7, 9, 11, 13, 15, 17, 19, 21, 23, 25, 27, 29, and 31.

14 numbers.

OPEN DISCUSSION OF THIS QUESTION IS HERE: how-many-odd-numbers-between-10-and-175184.html
_________________
Non-Human User
Joined: 09 Sep 2013
Posts: 8179
Re: How many odd numbers between 10 and 1,000 are the squares of integers?  [#permalink]

### Show Tags

11 Jul 2018, 22:57
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: How many odd numbers between 10 and 1,000 are the squares of integers? &nbs [#permalink] 11 Jul 2018, 22:57
Display posts from previous: Sort by

# How many odd numbers between 10 and 1,000 are the squares of integers?

## Events & Promotions

 Powered by phpBB © phpBB Group | Emoji artwork provided by EmojiOne Kindly note that the GMAT® test is a registered trademark of the Graduate Management Admission Council®, and this site has neither been reviewed nor endorsed by GMAC®.