#1
Does anyone have any advice for people that are planning on taking the general GREs for grad school? I took the practice GREs and didn't do very well, especially on the math based section. Some of the questions I just don't know how to approach/ haven't learned some secret voodoo strategy on how to guess about.

IE
Which is greater
9^7-9^5 OR 9^5*(80)?

or

Which of hte following is 850 percent greater than 8x10^3?
A. 8.5*10^3
B. 6.4*10^4
C. 6.8*10^4
D. 7.6*10^4
E. 1.6*10^5

This is without a calculator, by the way. My math major friends didn't know how to handle either of these, so help on these, and general advice would be greatly appreciated. Should I enroll in some sort of test prep? Its insanely expensive and I really can't afford it.
#3
...damn...I have to take this test soon. I'm going back to get my masters and I need to start studying!!!
#5
Quote by Sadistic sponge

Which of hte following is 850 percent greater than 8x10^3?
A. 8.5*10^3
B. 6.4*10^4
C. 6.8*10^4
D. 7.6*10^4
E. 1.6*10^5


C
because:

850% of something = 8,5 * something
Just remove the *10^3 (which means just *1000) from 8*10^3 and multiply 8 by 8.5, you find that the product is more than 8*8 (64), but less than 9*8 (72). Now you can see that it must be 68 (assuming the given possibilities are ok, which they are).
As you know, 68 is just 6,8*10^1; so it adds a extra 10^1 to 10^3 (the beginning), making it 6,8*10^4.


I am not sure about the first one (9^7-9^5 vs. 9^5*80), calculator says they are equal.
Last edited by someone_random at Feb 11, 2009,
#7
The GRE actual test was MUCH easier than the practice books...I bought two (don't remember which ones though, if you mention brands I'll remember them). Ended up getting a 570 Verbal, 800 Quantitative, and 5.5 Writing...the math was seriously simple as ****. Spend more of your time on memorizing buttloads of vocabulary.
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