vonLipwig

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Mathematics
1. Primes Question

If a number is divisible by a and b, then it is divisible by lcm(a,b ). (Lowest common multiple). It is not necessarily divisible by the product ab. For example, 60 is a multiple of 12 and of 10, but is not a multiple of 120. Similarly, looking at the powers of two, something that is a multiple of 4 and a multiple of 2 doesn't need to be a multiple of 8. (For example, the number 4). This is the issue in this question.
2. gre cutoff for statistics phd programs

I have no firsthand knowledge of this, but everyone seems to say that you just have to not do badly. I would imagine that that score is fine.
3. Dealing with students on the spectrum

Depending on the student, you may be able to make some progress by just talking to them - explaining that they need to stick to questions related to what you're talking about in class, but you're happy to talk about other stuff afterwards. This might at least reduce the frequency of interruptions and/or help you to shut them down faster when they do happen.
4. Experimental Section - Kaplan vs. ETS

Yes, I agree. Don't worry at all about the experimental section - just do your best to answer the questions.
5. Supplemental essay for subpar score?

I have no particular knowledge of what admissions committees would be thinking, but I don't think it makes sense for you to give an excuse that: - Anyone could make - Is unverifiable - Makes you look a bit silly If you think those four points or so are likely to make a difference, then you might need to take the test again, unfortunately.
6. What to do when you have no idea how good you are

I'd also suggest asking some academics at your current university for advice. They'll have a much better sense of how strong these universities are than we will.
7. New GRE Percentiles

From the following webpage: http://www.ets.org/gre/revised_general/scores/understand/%20 From this, it seems that equal scores would be given equal ranks, but that rank might shift as more people take the test.
8. Textbook Suggestions for Math Subject GRE

I also found the Princeton book very helpful, because it knew how much detail I needed to know about the various extra areas (complex analysis, for example).
9. GRE Verbal Vs. Quantitative

No worries - good luck with the test!
10. GRE Verbal Vs. Quantitative

This is false. Your test will contain three sections of one and two of the other, as well as the analytical writing, but only two of each section will count towards your score, and you are not told which two those are. My assumption is that the other section contains new questions which they are calibrating for difficulty.
11. I need help with a maths problem...

It really depends on the problem. What is it?