Clearing Data; Performing Simple Arithmetic - HP -80 Owner's Handbook Manual

Clearing Data
Entries can be cleared as follows:
Financial function entries can be cleared before or immediatel y after
they are loaded by pressing
CLX •
All other entries can be cleared before they are loaded by pressing
CLX •
After these entries are loaded, they can be cleared by pressing
CLEAR
• CLX
;the problem must then be reentered.
A blinking error signal can be cleared by pressing
CLX •
Constant storage is cleared by turning the calculator off then on , or
by writing over the present contents ; th at is, by storing a new number.
CLEAR
It isn't always necessary to clear the calculator (.
CLX
)-when start-
ing a new calculation-although it is usually comforting.
There are, however, certain applications that require clearing the
calculator before performing the calculation. They are:
• Discounted Cash Flow Analysis
• Mean; Standard Deviation
• Linear Regression (Trend
Line)
Analysis
Performing Simple Arithmetic
In the HP-80, arithmetic answers appear immediately after pressing
anyone of the arithmetic keys:
+ -
x +
For example, add 12 and 3.
Enter:
12
SAVE.
3
+
See Displayed:
- - - -
....
-
Did you notice that you calculated this sum in the same order in
which you would ordinarily do it with pencil and paper? That's right-
you keyed in 12 and separated it from the next number to be keyed in
(3) by pressing
SAVE.
after the 12. Then you pressed 3 followed by
+
to get the answer.
This same principle is used for calculating any arithmetic problem
having two numbers and one arithmetic operator.
For example, subtract 3 from 12.
Enter: See Displayed:
12
SAVE.
3 - • _
15