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/usr/share/doc/galculator/shortcuts is in galculator 1.3.4-1ubuntu4.

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Keyboard shortcuts

This is the current complete (?) list of keyboard shortcuts:

Numbers:

0, 1, ... , 9	ordinary digits
a, A	hexadecimal 10
b, B	hexadecimal 11
c, C	hexadecimal 12
d, D	hexadecimal 13
e, E	hexadecimal 14
f, F	hexadecimal 15

Arithmetic operations:

&	AND
|	OR
x, X	XOR (^ is used for power)
~	CMP
(	( - in RPN mode x<>y
)	) - in RPN mode rolldn
.,	. (decimal point)
+	addition
-	subtraction
*	multiplication
/	division
m,M	module
<	left shift
%	percent
=, Return	=

Popup Menus:

Alt-o 	Constants Menu
Alt-u 	User defined Functions
Alt-s	Memory Save
Alt-r	Memory Read
Alt-+	Memory Add

Functions:

Ctrl-Alt-e	EE
i, I	INV
h, H	HYP
!	n!
s, S	Sin
o, O	cOs
t, T	Tan
q, Q	sQuare (x^2)
r, R	sqRt
l, L	Log
n, N	lN
^, p, P power (x^y)

Display control:

Delete, ALT-C		C
Ctrl-Delete, ESC	AC
Backspace		<-

Menu shortcuts:

Ctrl-Q	quit program
Ctrl-X	Cut Display Value
Ctrl-C	Copy Display Value
Ctrl-V	Paste As Display Value
Ctrl-P	preferences dialog
Ctrl-D	change to decimal number base
Ctrl-H	change to hexadecimal number base
Ctrl-O	change to octal number base
Ctrl-B	change to binary number base
Ctrl-E	change to degree angle base
Ctrl-R	change to radiant angle base
Ctrl-G	change to GRAD angle base
Ctrl-A	change to (normal) algebraic notation
Ctrl-N	change to Reverse Polish Notation (RPN)
Ctrl-F	change to Formula Entry Mode
Ctrl-M	Hide/Unhide Menubar