A Word About The Hp-25 - HP 25 Owner's Handbook 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 a lway s
be reduced to a series of one- and two-number operation s. Just
work through the problem in the same logical 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
114.00
1 86.00
120.00
14.30
I ntermedia 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 fin al answer.
Now try these problems . Remember to work through them a s
you would with a pencil and paper , but don't worry about inter-
mediate answers-they're handled automatically by the
calculator.
Problems
(2
x
3)
+
(4
x
5)
=
1'-- 2_ 6_ . 0_ 0_----'
(, 1 4
+
12)
x
(18 - 12) _
r : [
:-:-::-c:--- - - ,
(9 - 7) -
L.C
7
-'C
8
o . : : . .
O
-=- 0 _ ----'
.fI6 .38 X 5
-,"---::-c=---
= 1181. 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 appreciate the benefits of th e Hewlett-Packard
logic system. With this system , you enter numbers usin g a
pa renthesis-free , unambiguous method called RPN (Reverse
Polish Notation).