HP 25 User Manual

22 Getting Started
results inside the calculator for you and brought them out on a
last-in, first-out
basis when it was time to multiply.
No matter how complicated a problem may look, it can always
be
reduced to a series of one- and two-number oper ations. Just
work through the problem in the same l og ic al order you would
use if you were working it with a pencil and paper.
For example , to solve:
Press
9mm:iD80
7 mm:iD 20
[±J
4mm:iD50
El
(9 x 8) + (7 x 2)
(4
x 5)
Display
172. 00
1 14.00
1 86.00
1 20.00
14. 30
I ntermedi a te result of (9 x 8).
Intermediate result of (7 x 2).
(9 x 8) added to (7 x 2).
Intermediate result of (4 x 5).
The final answer.
Now try these problems . Remember to work through th em as
you would with a pencil and paper , but don't worry about inter-
mediate answers-they're ha ndled automatically by the
calculator.
Problems
(2 x 3) + (4 x 5) = 1'-- 2_6_ .0 _0 _----'
(,14 + 12) x (18 - 12) _ r:[ :-:-:: -c:-- ---,
(9 - 7) - L.C
7
-'C
8
o.::. .
O
-=- 0_ ----'
.fI6 . 38 X 5
-,"---::-c=--- = 1 181. 00
.05
4 x (17 - 12) .;- (10 - 5) = 1'-4= .0 ..:.... 0 _----'
.J(2 + 3) x (4 + 5) + ..j(6 + 7) x (8 + 9) = 1L: 2 ___ 1._ 57 _---'
A Word About the HP-25
Now that you've learned how to use the calculator , you can
begin to fully appreci ate the ben efits of the Hewlett-Pack a rd
logic system. With this system , you enter number s using a
pa
renthesis-free , unambiguous method called RPN (Reverse
Polish Notation).

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