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...
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the pi button always located on the top of 'EXP' button.
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.