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HP HP-21 - Page 24

HP HP-21
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22
Controlling
the
Display
Press
Display
T
You
do
not
have
to
key
in
the
number
1
before
pressing
when
the
number
is
an
exact
power
of
10.
1.
06
6
1000000.00
Since
you
have
not
specified
scientific
notation,
the an-
swer
reverts
to
fixed
point
display
when
you
press
|
52
(%]
19230.77
To
see
your
answer
in
scientific
notation
with
six
decimal
places:
Press
Display
6
1.923077
04
To
key
in
negative
exponents
of
ten,
key
in
the
number,
press
E33
.,
press
[
to
make
the
exponent
negative,
then
key
in
the
power
of
10.
For
example,
key
in
Planck’s
constant
(h)—
roughly,
6.625
x
10727
erg
sec—
and
multiply
it
by
50.
Press
Display
ESlok
6.625
2
CHS
6.625
-00
27
6.625
-27
6.625000
-27
50
[x]
3.3125000
Erg
sec.
Using
the
@@Jkey,
you
can
key
in
numbers
made
up
of
10-digit
mantissas
and
two-digit
exponents
of
10.
However,
when
you
use
the
@@
key,
the
HP-21
displays
each
number
as
an
eight-

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