software to document and develop projects

[Gary L. Roach]

I have been trying  to find a software package that would allow me to do 
math calculations along with running documentation.I have tried using 
-Octave but it doesn't allow modification of content once you hit the 
enter key. After a few mistakes and corrections things get so messy that 
content is unreadable. I need something that will allow corrections to 
be made.in both the math and text. Anyone have a suggestion.

Gary R