HP 20b Consultant Financial, 30b Professional Storing and Recalling Numbers, Recall Arithmetic

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 :$, followed by

the key representing the memory number. To recall a number stored in a memory, press L

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 15:$1.

To recall the number in memory 1, press L1.

You can also perform operations to numbers stored in memories. For example, press 5:$2to store 5 in memory 2. To add 12 to the value of memory 2, press

12:$+2. Later on, during a calculation, you can press L2 to recall memory 2. Note how the current value now stored in memory 2 is 17, (5 +12). +-*and /are valid mathematical operations for memories.

To view the stored values in memories 1–9 and 0, press :t, followed by <

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 tkey.

Recall Arithmetic

In RPN, typing L+2adds the value of memory 2 to the first level of the stack, but it will not modify the stored value of memory 2. This is useful, as it "saves" one stack level.

You can also use -*and /after L.

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 Lfollowed by the key of the desired TVM variable.

Note: pressing Ldoes not calculate the variable; it recalls the current value.

24 Mathematical Calculations