#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.

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.

#2

A, as a quick answer. im courious to see if i picked it right, ill be back

#3

...damn...I have to take this test soon. I'm going back to get my masters and I need to start studying!!!

#4

Please don't just post the answer, explain what your doing for us- I won't pick anything up from just teh answer.

#5

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,*

#6

9^7-9^5=9^5(9^2-1)=9^5(81-1) = 9^5(80)

#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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