HP15C LE Bad Button Presses

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Good evening,

I'm using my HP-15c LE just about twice a week, for any calculation a simple 4-operations calculator could do. It is not a REAL WORK as engineers understand that, but I don't care: it is just important for me as a French teacher and school manager - quite far from scientific daily problems.

If I have to do some more sophisticated calculations - yes, it might occur -, well, I have a good choice, from my HP-21 to my Free42 app and even my 48 calcs - I didn't venture into Prime's or Numwork's dominions but who knows?