exponent
This topic has expert replies
-
- GMAT Instructor
- Posts: 1223
- Joined: Thu May 01, 2008 3:29 pm
- Location: Los Angeles, CA
- Thanked: 185 times
- Followed by:15 members
I think the best way to do this one is to estimate. You should know that the square root of 25 is 5. So, since this is very close to the square root of .0025, the answer must be .05. Also, as pointed out, it's useful to know that it can't be any of the answers ending in 6 because that puts it closer to 36 than to 25.
Another way to do it is to work backwards, by squaring the answer choices. If they yield .0025, that's the answer.
If we take .05*.05, we get .0025. Try squaring the other answer choices, and they are way off.
Hope this helps!
Another way to do it is to work backwards, by squaring the answer choices. If they yield .0025, that's the answer.
If we take .05*.05, we get .0025. Try squaring the other answer choices, and they are way off.
Hope this helps!
Jim S. | GMAT Instructor | Veritas Prep
- VP_RedSoxFan
- GMAT Instructor
- Posts: 85
- Joined: Thu May 01, 2008 12:56 pm
- Location: Salt Lake City, UT
- Thanked: 24 times
- GMAT Score:750+
I like the answers given, but if you decide to "plug numbers", you should do it intelligently, after some consideration since squaring some answer choices (not necessarily these) could be a little hairy.
My point is to start with your best guess rather than just moving from A to E sequentially until you find what you're looking for.
My point is to start with your best guess rather than just moving from A to E sequentially until you find what you're looking for.
Ryan S.
| GMAT Instructor |
Elite GMAT Preparation and Admissions Consulting
www.VeritasPrep.com
Learn more about me
| GMAT Instructor |
Elite GMAT Preparation and Admissions Consulting
www.VeritasPrep.com
Learn more about me