HP 20b HP 20b Calculator Quick Start Guide - Page 32

Recalling Stored Numbers, Rounding Numbers

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Mathematical Calculations 4. To recall a number, press L. With RCL displayed in the top line, key in the number of the memory you used. You can also perform operations to stored numbers. For example, press 5:$2 to store 5 in memory 2. To add 12 to the value of memory 2, press 12:$+2. Later on, during a calculation, you can press L2 to recall memory 2. Note how the new current value is 17, (5 +12). +-* and / are valid mathematical operations in the storage memories. Recalling Stored Numbers In RPN, typing 12L+2= adds the value of memory 2 to 12, but it will not modify the stored value of memory 2. You can also use -* and / after L. In Algebraic and Chain modes, press 12+L2=. Rounding Numbers The 20b performs all calculations internally with 15-digit precision and rounds to 12 digits when returning the results. When displayed, a number is 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. 32

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Mathematical Calculations
32
4.
To recall a number, press
L
. With
RCL
displayed in the top line, key
in the number of the memory you used.
You can also perform operations to stored numbers. For example, press
5:$2
to store
5
in memory 2. To add 12 to the value of memory 2,
press
12:$+2
. Later on, during a calculation, you can
press
L2
to recall memory 2. Note how the new current value is
17
, (5
+12).
+-*
and
/
are valid mathematical operations in the storage
memories.
Recalling Stored Numbers
In RPN, typing
12L+2=
adds the value of memory 2 to 12,
but it will not modify the stored value of memory 2. You can also use
-*
and
/
after
L
.
In Algebraic and Chain modes, press
12+L2=
.
Rounding Numbers
The 20b performs all calculations internally with 15-digit precision and rounds to
12 digits when returning the results.
When displayed, a number is 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.