A small challenge  Printable Version + HP Forums (https://archived.hpcalc.org/museumforum) + Forum: HP Museum Forums (https://archived.hpcalc.org/museumforum/forum1.html) + Forum: Old HP Forum Archives (https://archived.hpcalc.org/museumforum/forum2.html) + Thread: A small challenge (/thread144765.html) 
A small challenge  Paul Dale  12172008 Since things seem to be very quiet I thought I pose a small challenge for the season. Given a memory cleared HP12c 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} 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).
Re: A small challenge  Katie Wasserman  12172008 here's one: [3][5][ENTER][%] another: [.][0][8][1/x]
Edited: 17 Dec 2008, 11:30 p.m.
Re: A small challenge  Paul Dale  12172008 Quote: This is what I had in mind.
Quote: Not quite, this is 12.50 which isn't quite right :)
Re: A small challenge  Katie Wasserman  12172008 Quote: What can I say, I work in government :)
Re: A small challenge  Paul Dale  12182008 In that case you should have found the two key solution:
[1][2] :) Still a good effort finding the % solution.
Re: A small challenge  Dave Shaffer (Arizona)  12192008
Quote: If you've set FIX 2, then 1 5 0 SQRT
will show 12.25 , again in 4 strokes.
Re: A small challenge  Paul Dale  12212008 The 12c has a square root function in an unshifted position? So this should really be:
1 5 0 g SQRT at five.
Re: A small challenge  Dave Shaffer (Arizona)  12212008 Oops! I don't have a 12C and didn't realize that it doesn't have an instant access square root (and I even wondered whether it did a couple of days ago, when I first thought about my scheme  and tested it on a 33S).
