Since things seem to be very quiet I thought I pose a small challenge for the season.

Given a memory cleared HP-12c what is the minimum number of keystrokes required to have 12.25 on the display.

Clearly, this can be done in five keystrokes. Can anyone do it in four or fewer?

If x^{2} was available without a shift key then here are two ways to do it:

3 . 5 x^{2}

7 x^{2}4 /

Unfortunately, x^{2} isn't even present on the 12c.

Can anyone do this for other calculators? Assume the display mode is appropriately set (i.e. don't count any keystrokes for this).

- Pauli