HP 30b Business Professional Calculator User Manual

Page 24

Mathematical Calculations

Pressing

when you are not entering a number duplicates the number on

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

after

duplicates 77 on the stack, making

Levels 1 and 2 equal. See Figure 5.

Table 2-3 Simple Arithmetic Calculations in RPN Mode

Keys

Display

Description

RPN Stack

3I4

Inputs the numbers and the
operation in the first set of
parentheses. Intermediate
results are displayed. Note
the (+) and (RPN)
annunciators.

5I6

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.

Value