Try doing it back to front.
Select (highlight) the number (519) then type 58+ (or minus).
Works for addition and subtraction but not multiplication and division.
Should work in most numerical input fields (track, info box, co-ordinate palette, etc.).
Barry.
One of the forum moderators.
Versions 6.5 to 25
Dell XPS- i7-6700 @ 3.4Ghz, 16GB ram, GeForce GTX 960 (2GB), Windows 10
Dell Precision 3510 - i7 6820HQ @ 2.70GHz, 16GB RAM, AMD FirePro W5130M, Windows 10