Recall Arithmetic; Storing And Recalling With Time Value Of Money (Tvm) Keys; Recalling A Menu Item Value In A Menu; Rounding Numbers - HP 20B User Manual

L2
to recall memory 2. Note how the new current value stored in memory 2 is 17 , (5 +12).
press
/
are valid mathematical operations for memories.
To view the stored values in memories 1-9 and 0, press
through each memory starting with memory 1 ( Mem 1 ). Note that in the Memory menu, you can change the value of any
memory by selecting the memory and typing a number followed by the

Recall Arithmetic

12L+2
In RPN, typing
stored value of memory 2. This is useful, as it "saves" one stack level. You can also use
To perform the same operation in Algebraic and Chain modes, press

Storing and Recalling with Time Value of Money (TVM) Keys

To store the current number in the Time Value of Money (TVM) variables, press
To recall the stored value of a TVM variable, press
does not calculate the variable; it recalls the current value.

Recalling a Menu Item Value in a Menu

In a menu, you can recall the current value of a menu item. For example, open the Interest Conversion menu (IConv) by
:&
. With Nom.% displayed, pressing
pressing
when you need to insert the contents of a menu item into an algebraic operation.

Rounding Numbers

All calculations are performed internally with 15-digit precision and are rounded to 12 digits when returning the results. In
certain instances, calculations are performed internally with greater than 15-digit precision.
When displayed, a number is further rounded to the number of digits after the decimal point set by the FIX item in the Mode
menu. The default setting is two digits to the right of the decimal point. For more information, refer to the section titled, The
Mode Menu: Setting Preferences in Chapter 1 .
Note: the FIX setting only affects the display; it does not affect the actual numbers.

Percentages

In Algebraic or Chain modes, pressing
:t
adds the value of memory 2 to the first level of the stack, but it will not modify the
L
followed by the key of the desired TVM variable. Note: pressing
2*L=
%
divides a number by 100. For example, pressing
28
Mathematical Calculations
< >
, followed by or
t
key.
-*
12+L2=
:$
followed by the desired TVM key.
recalls the nominal rate. This feature is useful
25%
+-*
and
repeatedly to scroll
/ L
and after .
.
L
returns 0.25.