They are the same thing, Casio calls it FX-115ES in some countries, such as the U.S., and FX-991ES in most other countries. I believe this has to do with model name recognition. "FX-115" has been used in various U.S. models for a long time.
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"Road Calculation & setting out" Basic program for Casio Calculator fx-880p.
Math
no-can-dosville babydoll
No, it's not programmable.
Yes.