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HP HP-21 - Chain Calculations

HP HP-21
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12
Getting
Started
Now
try
the
following
problems
using
the
[**
key,
keeping
in
mind
the
simple
rules
for
two-number
functions:
16*
(16
to
the
4th
power)
=
812
(81
squared)
=
2255
(square
root
of
225)
=
also
performs
this
as
a
one-num-
ber
function.)
216
(2
to
the
16th
power)
=
Chain
Calculations
The
speed
and
simplicity
of operation of
the
HP-21
become
most
apparent
during
chain
calculations.
Even
during
the
longest
of
calculations,
you
still
work
with
only
one
or
two
numbers
at
a
time—the
unique
Hewlett-Packard
automatic
memory
stores
intermediate
results
until
you
need
them,
then
inserts
them
into
the
calculation.
The
process
of
working
through
a
problem
is
as
natural
as
it
would
be
if
you
were
work-
ing
it
out
with
pencil
and
paper,
but
the
calculator
takes
care
of
the
hard
part.
For
example,
solve
(12
+
3)
X
7.
If
you were
working
the
problem
with
a
pencil
and
paper,
you
would
first
calculate
the
intermediate
result
of
(12
+3)
. . . .
15
(2437
x
7=
. .
and
then
you would
multiply
the
intermediate
result
by
7.
15
(2437
%
7
You
work
through
the
problem
exactly
the
same
way
with
the
HP-21,
never
working
with
more
than
two
numbers
at
a
time.
You
solve
for
the
intermediate
result
first.
. .
(12
+
3)
Press
Display
12
3
3

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