Tasadduk

Compare: A: (100,210)(90,021) B: (100,021)(90,210) I ran into problems like this a few times in my practice tests (PowerPrep), and only thing I could do to compare A and B is by multiplying out. Now, here is a quicker way to do this: A: (100,210)(90,021) = (100,000 + 210)(90,000+21) = (100,000)(90,000) + (100,000)(21) + (210)(90,000) + (210)(21) B: (100,021)(90,210) = (100,000 + 21)(90,000+210) = (100,000)(90,000) + (100,000)(210) + (21)(90,000) + (21)(210) Now, we're down to comparing A: (100,000)(90,000) + (100,000)(21) + (210)(90,000) + (210)(21) B: (100,000)(90,000) + (100,000)(210) + (21)(90,000) + (21)(210) Since those terms appear in both, we can strike 'em out. Now, we're down to comparing A: (100,000)(21) + (210)(90,000) B: (100,000)(210) + (21)(90,000) Let's do more factoring: In A, factor out 21 and get: (21)[100,000 + (10)(90,000)] = (21)(1,000,000) In B, factor out 21 and get: (21)[(10)(100,000) + 90,000] = (21)(1,090,000) Now since both A and B are multiples of 21, We just need to compare 1,000,000 and 1,090,000. Which one's bigger? B! I know it seems long, but I actually do this way much faster than straight multiplication. And if you're really good in math, you can probably skip a lot of the steps above and do them in your head, and arrive at the result much quicker. Here's an exercise if anyone likes: Compare: A: (23)(784) B: (24)(783)

Sorry... one more question. Does the real exam show you which problem number you are on? PowerPrep only showed this when I was working on reading comprehension or on a chart problem. I guess if it doesn't, I'd have to keep track of numbers on my own.

Great! It should prepare me well for the exam then as opposed to other practice exams available out there.

thanks guys, that helps. Another question, is PowerPrep CAT as the real exam, or it just throws you a whole bunch of random questions?

Hi guys. I took the Powerprep practice test for the first time today. Scored a 740 on the quantative, yay! And verbal score is not even worth mentioning, I need to practice my words and reading passages much faster. Anyway, my question is, does the real exam constantly show the time? My PowerPrep showed the time in the beginning of the test (with the writing part) but it disappeared after that, and I couldn't bring it back by thousands of clicks on the time button. I had to use my own watch to time myself. Anyways, does the real exam show the time constantly? If not, it would be a huge problem for me. Considering the fact they don't let you bring a watch in the testing center.

I haven't taken GRE yet, but I found a question on standard deviation on PowerPrep's practice problems. I was actually able to answer the question without having to calculate the actual SD's. But it's is good to know mean, mode, standard deviation concepts if you ask me, since they are mentioned in ETS's math review. My question is, what about Normal Distribution? Can you expect a question like that on the test? I actually found a problem with normal distribution on PowerPrep as well, I didn't know how to answer it.

Hi. I'm planning to take GRE for the first time at the end of this October. For those of you who have taken the GRE recently... other than then the usual GRE type questions (i.e. Verbal: Antonyms, Analogy, Sentence Completion, Reading Comprehension... Quantitative: Quant Comp, Problem Solving) were there any new types of questions on any of the two sections? "Two new question types are included in the computer-based GRE® General Test. You may see one new Verbal or one Quantitative question in your test. These new questions will be counted toward examinee scores as soon as an adequate sample of data has been collected." That's from ETS website, and it is NOT for the revised test of next year. Looks like they added numeric entry in the quantitative, and a new type of reading comprehension on the verbal. Did anyone encounter these types of questions? Let me know guys. Thanks.