I have a 3.8 but I just round it and write or say "4" or "4-point." I think it's much more efficient that way. It's also more correct, since GPAs only have 1 significant figure (A=4, B=3, etc. -- even w/ +/- there are only about 10 increments so still... b/c who really gives a "D+"?)! [/sarcasm]
Okay, let me clear this up.
GPA's deal with
assigned, not measured, numbers for certain letter grades. Therefore, they have an infinite amount of significance, and no uncertainty associated with them. Think of formulas where an integer is used for a little more clarity. Typically you would use significant figures when dealing with tools which make measurements and estimate or round the last reported digit.
Harmonics are a great example of this:
For standing waves---> wavelength = Length of string*n/2
n is your harmonic number----> it is accurate to as many decimal places as need be and therefore does not affect the accuracy of the wavelength represented in the formula.
The length of the string is measured and will have an uncertainty that must be respected in a reported value because man made tools are not 100% accurate.
So really by assigning a 4 to an A, they are kinda saying 4.000000000000000000... and so on. There is no uncertainty associated with the numbers accuracy.
With this in mind, a typical transcript (mine at least) reports the letter grade to two decimal places because it gives enough of an idea as to what the students coursework reflects. If you really wanted to impress admissions with your grade performance, write the extra decimal places so you don't create unnecessary uncertainty in the viewers mind.
If I saw someone report their GPA as a 4 I would conclude that they have somewhere between a 3.50 to a 4.00 and so on. Reporting to two decimal places makes it nearly impossible for someone with a B on their record to show a 4.00... it would say 3.99 or somewhere around that area.
In my opinion, stick to the standards reported on your transcript so that no one suspects a character flaw.
I would however recommend that you somewhere show that your GPA is based on a 4 point scale.