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HP HP-21 - CLX Key Ottt E; Keying in Numbers; Keying in Negative Numbers

HP HP-21
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8
Getting
Started
To
begin,
slide
the
On-Off
switch
to
ON.
Press
a
few
keys
at
random
and
watch
the
display
lights
change.
You
can’t
hurt
the
HP-21.
Key
Now
you’re
ready
to
work
through
a
few
simple
problems.
First,
clear
any
numbers
now
in
the
display
by
pressing
the
[S€3
(clear
x)
key.
This
returns
the
display
to[0.00
|.
Your
HP-21
has
a
keyboard
and
a
display.
The
display
is
used
to
show
you
numbers.
The
keyboard:
s
is
used
to
key
numbers
into
the
calculator.
=
is
used
to
tell
the
calculator
to
perform
operations
upon
those
numbers.
Keying
In
Numbers
Key
in
a
number
by
pressing
the
number
keys
in
sequence,
just
as
though
you
were
writing
on
a piece
of
paper.
The
decimal
point
must
be
keyed
in
if
it
is
part
of
the
number.
For
example:
Key
in
148.84
by
pressing
the
keys
(1]
(a] (8]
[]
(8] [4]
The
resultant
number
148.84
is
seen
in
the
display.
If
you
make
a
mistake
when
keying
in
a
number,
clear
the
entire
number
string
by
pressing
[§B3.
Then
key
in
the
correct
number.
Keying
In
Negative
Numbers
To
enter
a
negative
number,
key
in
the
number,
then
press
(change
sign).
The
number,
preceded
by
a
minus
(—)
sign,
will
appear
on
the
display.
For
example:
Press
Display
-148.84
To
change
the
sign
of
a
negative
or
positive
number
on
the
display,
press
[l
.
For
example,
to
change
the
sign
of
the
—148.84
now
in
the
display:
Press
Display

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