GMAT Math help

[Impact]

Im studying for the GMAT. What pisses me off about it the most so far is the amount of math you have to do by hand. Do you have any advice for handling this, especially the division? I havent done math like this without a calculator in years(and im no genius) so its kinda overwhelming, especially considering the avg time of 2 minutes per question. I feel that trying to figure out how to solve the problem plus doing the math is going to be difficult within the allotted time frame.