HP 30b - Business Professional Calculator User Manual page 24

Table 2-3 Simple Arithmetic Calculations in RPN Mode
Keys
3I4
+
5I6
+
*
I
Pressing
Level 1. That is, the number on Level 1 is pushed on the stack, making Levels 1 and 2 equal.
In the example above, pressing
Levels 1 and 2 equal. See Figure 5.
16 Mathematical Calculations
Display
=
or when you are not entering a number duplicates the number on
I
Description
Inputs the numbers and the
operation in the first set of
parentheses. Intermediate
results are displayed. Note
the (+) and (RPN)
annunciators.
Inputs the numbers and the
operation in the second set
of parentheses.
Intermediate results are
displayed. Note the (+)
annunciator.
Finishes the operation and
displays the results.
*
after duplicates 77 on the stack, making
RPN Stack
Previous
Value
Previous
Value
Previous
Value
7
Previous
Value
Previous
Value
7
11
Previous
Value
Previous
Value
Previous
Value
77