HP 25 User Manual

Getting Started 19
system makes the process of working through a problem as
natural as it would be if you were working it out with pencil and
paper, but the calculator takes care of the hard part.
For example, solve (12 + 3) x 7.
If you were working the problem with a pencil and paper , you
would first calculate the intermedi a te result of (12 + 3).
(11
I 3t x 7 =
IS-
. and then you would mUltiply the intermediate result by 7.
~ x 7= 105
15 X 7
You work through the problem exactly the same way with the
HP-25 , one operation at a time. You so lve for the intermediat e
result first ...
(12 + 3)
Press
Display
12
1
12
.
]
mmm
1
12
.
0
0
1
3
1
3
.
1
[±J
1
1
5.00
I
Intermediate result .
.
and then so lve for the final an swe r. You don 't ne ed to
press mmm to sto re the intermediate result-the HP-25 a uto-
matically stores it ins ide the calculator when you key in the next
number. To continue.
Press
Display
7
1 7.
1
1
05.00
The intermediate result from the pr e-
ceding operation is a utomatic a ll y
stored ins ide the calc ul a tor when you
key in this number.
Pres sing the function key multiplie s
the n ew number a nd the intermedi ate
re s ult , givi ng you the final answer.

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