HP 25 User Manual

One-Number Functions
To use anyone -n umber function key:
I.
Key in the number.
2. Press the function key (or press the applicable pr efix key ,
then the function key).
For ex a mple , to use the one - number function 00 key , you fir st
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 m oo .
Press
Display
4
1
4
.
m
1 4.
00
10.25
Now try these other one -number function problems. Remem-
ber , first key in the number, then press the 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 have 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 i ons - that is, the oper ati on
occurs when the function key is pressed . Therefore , both nllm-
ber s must be in the calculator be fore the ful1 c tiol1 k ey is pressed.
When more than one number must be keyed into the calculator
before performing an operation, the mm key is u sed to
separate the two numbers.

HP 25 Specifications

General

Power Source	Rechargeable battery pack
Programming Steps	49
Release Year	1975
Functions	Trigonometric, logarithmic, statistical
Type	Scientific
Dimensions	148 x 80 x 14 mm