Two-Number Functions; Addition And Subtraction; Multiplication And Division - HP -28S Manual

Two-Number Functions
Functions that act on two numbers-such as addition-are called
two-number functions. All act on the numbers in levels 1 and 2.
When you're keying in both arguments to the function, as when you
divided 2 by 3 on page 36, you must press
1 ENTER 1
to separate the two
arguments. When one or both arguments are already on the stack
from previous calculations, you don't need to press
1 ENTER I.
Addition and Subtraction
Calculate 36
+
17.
36 1 ENTER
I
17
~
The result is 53.
3: -4.2E-12
2: .125
1: 53
1iiD~lIIBIrnaomDllJl
For addition the order of the numbers doesn't matter. However, the
order is important for subtraction. Next calculate 91 - 27.
91
I
ENTER
I
3: .125
2: 53
27
G
1: 64
The result is 64.
Multiplication and Division
Calculate 13
x
6.
131ENTERI
60
The result is 78.
1iiD~lIIBIrnaomDllJl
3: 53
2: 64
1: 78
1iiD~lIIBIrnaomDllJl
2: Doing Arithmetic 41