I answered 3/4 and was marked incorrect. Do I have to enter a decimal?
This is definitely worth taking note of. There's nothing worse than getting the correct answer to a problem and being marked wrong!
If the answer calls for a fraction, there will be two boxes in which to put your answer—one for the top part of the fraction (numerator) and one for the bottom (denominator). If you only see one answer box, you have to write in a decimal. The GRE will not accept a fraction written in one box.