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More:"All I wish someone had told me about GMAT beforehand" There are many things you want to know before doing the GMAT exam (how is exam day, what to expect, how to think, to do's...), and you have them in this blog, in a simple way

Re: Of the following, which is most nearly equal to √10? [#permalink]
24 Mar 2013, 03:03

Now take the square of 3.1i.e, 3.1X3.1= 9.64 Now the next number has to be closer to 10 You can check by taking the square of 3.3 and then zero down on 3.2! _________________

I've failed over and over and over again in my life and that is why I succeed--Michael Jordan Kudos drives a person to better himself every single time. So Pls give it generously Wont give up till i hit a 700+

Re: Of the following, which is most nearly equal to √10? [#permalink]
21 Feb 2015, 19:37

anujtsingh wrote:

Of the following, which is most nearly equal to √10?

a 3.3 b 3.4 c 3.5 d 3.1 e 3.2

Square root of 10 can be written as square root of 5 times square root of 2. Square root of 5=2.23 and square root of 2 is 1.41 - multiply these together and the answer you get is closest to 3.2.

Of the following, which is most nearly equal to √10? [#permalink]
22 Feb 2015, 04:13

1

This post received KUDOS

Expert's post

Bunuel wrote:

anujtsingh wrote:

Of the following, which is most nearly equal to √10?

a 3.3 b 3.4 c 3.5 d 3.1 e 3.2

The correct answer is 3.2 (E), not D.

Let us simply take squares of all options. 3.1 * 3.1 = 9.61 3.2 * 3.2 = 10.24 Since it has already crossed 10 (i.e. the square of √10), we need not go further and need to decide between 3.1 and 3.2 10 - 9.61 = 0.39 10.24 - 10 = 0.24 Since 0.24 is lesser of the both, so 3.2 is closer. Hence (E).

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