One-number functions and the math menu – HP 30b Business Professional Calculator User Manual

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Mathematical Calculations

Pressing

performs a swap. A swap operation exchanges the numbers on Levels 1 and 2

of the stack. The

key has a small symbol to the right of the parenthesis symbol to indicate

the swap feature. With the numbers entered into the stack shown in the left column in Figure 7,
pressing

performs a swap to the stack as shown in the right column.

Figure 7 The RPN Stack and the Swap Operation

NOTE: when no menu is selected, the

key performs the same function as the

(

key.

The

key performs the inverse operation called, roll up.

One-Number Functions and the Math Menu

The key presses for the one-number mathematical functions listed in Table 2-4 below apply to

all modes, Chain, Algebraic, and RPN. To execute one-number functions, with a number

displayed, press the key or key combination corresponding to the operation you wish to

execute. The result is displayed on the bottom line.

For example, to calculate

, press

6:n

. The result of 2.45 is calculated

immediately and displayed on the bottom line. Note the square root symbol appears on the

top line.
NOTE: before doing any trigonometric calculations in the Math menu, check whether the

angle mode is set for degrees (Degree) or radians (Radian). You will need to change the

setting if the active mode is not what your problem requires. For more information on the

Mode menu and calculator settings, refer to the section titled, The Mode Menu: Setting

Preferences in Chapter 1. Table 2-4 lists one-number functions along with their corresponding

keys.

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