HP 25 Owner's Handbook Manual page 20

One-Number Functions
To use anyone-number function key:
I. Key in the number.
2. Press the function key (or press the applicable prefix key ,
then the function key) .
For exa mple , to use the one-number function
00
key , you first
key in the number represented by
x,
then
pr~ss
the function key .
To calculate
1/4,
key in 4 (the x -number) and press
moo .
Press
Display
4
1
4 .
m
14.
00
10.25
Now try these other one-number function problems. Remem-
ber, first key in the number, then press th e fun r: tion:
25
=
10.04
vTsOO
=
~ 1 5~ 0.~ 00 ~====:
10
5
=
1100000.00 (Use the [iifl key .)
..J
3204100
=
11790.00
log 12.58925411
=
~ 1 1~ .1~ 0 ~==~
71 2
=
L": 1 5:.::. 0..:.. 41 :.:.. .0 : :.: 0 ~_-...-J
Two-Number Functions
Two-number functions are functions that must ha ve two num-
bers present in order for the operation to be performed.
[±)
G 0
and EJare examples of two -number function keys because you
cannot add, subtract , multiply , or divide unless there are two
numbers present in the calculator. Two-number function s work
the same way as one-number funct ions - that is, the operati on
occurs when the function key is pressed . Therefore , both nllm-
bers must be in th e ca lc ulator before th e ful1 ctiol1 key is pressed.
When more than one number must be keyed into the calculator
before performing an operation, the
mm
key is used to
separate the two numbers.