Working with PTC Mathcad Prime > Mathcad Workspace > General Keyboard Shortcuts
  
General Keyboard Shortcuts
Keystroke
Action
F1
Opens the PTC Mathcad Help.
Ctrl+F1
Minimizes or maximizes the Ribbon.
F5 or F9
Calculates the active math region or plot and all related regions.
Ctrl+F5
Recalculates all the regions in the worksheet.