Unit conversion tools not working?

[ndzied1]

It would be helpful to know what version of the firmware is in your prime.

You can get this by pressing the Help key (top row left of ESC) then selecting Tree from the soft menu then double tap on the first branch "About HP Prime".

Report back what is says next to Software Version:

For instance mine says
2016 04 14 (10077) so we call this version 10077