Can you explain the GRE calculator?

The GRE calculator can at times be very frustrating. It has very limited computational functions, and it won't exceed 99,999,999. However, we have several resources to help you familiarize yourself with the calculator:

Some general information: http://magoosh.com/gre/2011/can-i-use-a-calculator-on-the-new-gre/

Strategies to make the most effective use of the calculator: http://magoosh.com/gre/2011/calculator-strategies-for-the-revised-gre/

The importance of remembering how to do "mental math" for the exam: http://magoosh.com/gre/2012/mental-math-on-the-gre/

And lastly, information about the Magoosh GRE calculator (which is practically the same as the one you will see on the actual exam): http://magoosh.com/gre/2011/the-new-gre-calculator/