HH, Are you able to tell where focus is when a calculation completes? It is a bit of a pain that you can't copy the answer unless you are doing the equivalent of hovering over the answer display, right clicking, and selecting copy from the context menu.
You also have the possible option of installing and playing around with Microsoft Mathematics, which is free and most of which will be overkill for simple calculations, but it certainly can work like a simple calculator but is far more "program like" and JAWS should interact with it as such. Another option is actually installing the older version of Windows calculator, which will work under Win10. A third is trying out an alternate calculator app from the app store, there are literally over 1000 options (many of which you could dismiss out of hand) but I'd bet one of them will work like the older windows calculator did. Brian
