GMAT Math online Crash Course

Our GMAT Druids (tutors) are putting together an online seminar/crash courses on Maths concepts to help ScoreChase members. It seems quite a few members find the need to brush up concepts on Math [From discussion on this thread http://www.scorechase.com/gmat/showthread.php?p=47543] and a quick overview can help build concepts. 

1 seminar would have 3 topics (depends on the length of topics) and would last about 2 hrs [about 45 min each topic]. But the question we have for you is:

  Which topics would you like to see on the seminar? [please be specific]. Please post your suggestions here: Topic suggestions for online Math Crash Course. 

[If there are more than 3 requested topics, we will have multiple seminars spanning those topics]. Once we have decided the first three topics, we will announce a date for the web seminar.