I was wondering if anyone here has a program for their ti-89 that can add and subtract dimension in ff.iiss format. Also it would be great if you could convert ff.iiss to decimal feet and vise versa. For example I would want to enter in 10.0608 (10 feet 6 and a half inches) and convert it to decimal feet and get the answer of 10.5416. I would also like to be able to add and subtract dimensions in the same ff.iiss format. Does anyone have a program that can do this? I would try and make one but have no idea how to even start. Thank you for the help.