Sketching with fractional dimensions input (Imperial system)

Hi everyone,

I'd like to know how to input lengths in fractional system. I want to create a simple rectangle of [ 27' 11_3/4'' by 11' 6_1/2'' ] how do I do this without converting dimensions to decimal, or the part that is in inches to a single fraction??

I have attached a plant layout of equipment, I'm trying to sketch.

Thanks in advance!