Storing And Recalling Numbers; Recall Arithmetic; Storing And Recalling With Time Value Of Money (Tvm) Keys - HP 30b - Business Professional Calculator User Manual

Storing and Recalling Numbers

The calculator has ten memories available for use during calculations. These memories are
numbered from 1–9 and 0. To store a number in a memory, press
the key representing the memory number. To recall a number stored in a memory, press
followed by the key representing the memory number. You can use the store and recall
functions for these memories any time a number is displayed, or when you wish to enter a
number.
For example, to store 15 in memory 1, press
To recall the number in memory 1, press
You can also perform operations to numbers stored in memories. For example, press
5:$2
12:$+2
to recall memory 2. Note how the current value now stored in memory 2 is 17, (5 +12).
+-*
To view the stored values in memories 1–9 and 0, press
>
or repeatedly to scroll 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

L+2
In RPN, typing
it will not modify the stored value of memory 2. This is useful, as it "saves" one stack level.
You can also use

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

To store the current number in the Time Value of Money (TVM) variables, press
followed by the desired TVM key.
To recall the stored value of a TVM variable, press
TVM variable.
L
Note: pressing
24 Mathematical Calculations
to store 5 in memory 2. To add 12 to the value of memory 2, press
. Later on, during a calculation, you can press
/
and are valid mathematical operations for memories.
t
adds the value of memory 2 to the first level of the stack, but
-* /
and
does not calculate the variable; it recalls the current value.
15:$1
L1
.
:t
key.
L
after .
L
followed by the key of the desired
:$
, followed by
L
.
L2
<
, followed by
:$