Coincidence . . . this contributor just now stumbled across this question, and just
happens to also be using a CASIO fx-260solar.
Whenever you have any number in the window and you press [shift]-[square-root],
the number in the window changes to the square-root of the number that was there
before you pushed the button.
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On my CASIO fx-115MS it is the "log" button you need to press the "shift" button then press log and a small "10" will appear on your calculator screen. Hope this helps...
You press the SHIFT button and then you press the x10 button.
it's above the no 7 along with the STO button as a shift activated key
The INV button is the same as the SHIFT button on the top left corner of the buttons (the leftmost button under the screen).
"Road Calculation & setting out" Basic program for Casio Calculator fx-880p.