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Press
34
lED
21
Display
I
34.
I
34.00
I
21
.
The Automatic Memory Stack
41
34
is
keyed into X.
34 is copied
into
Y.
21
writes over
the
34 in
X.
Now 34
and
21
are
sitting vertically in
the
stack
as
show
n
below,
so we can add.
T
0.00
1
Z
0.00
Y
34.00
X
21.
Display
Press
Display
[±J
1
55 . 00
The
answe
r.
The simple, old-fashioned math notation helps
explain
how
to
use your calculator. Both numbers are always positioned
in the
stack in
the
natural order first
;
then the operation is executed
when
the function key is pressed.
There
are
110
exceptions to
this rule
.
Subtraction, multiplication,
and
division work the
same way
.
In each case,
the
data must be
in
the proper position
before the operation can be performed
.
To subtract
21
from 34:
Press
Display
34
1
34 .
mum
1
34.00
21
1
21.
B
1
13.00
To mUltiply 34 by
21:
Press
Display
34
mum
21
~
1
34.
1
34.00
1
21.
1
714.00
34
-
21
34 is keyed into X.
34 is copied into Y
.
21
writes over the 34 in X.
The
answer.
JA
x
21
34
is
keyed into X.
34 is copied into Y.
21
writes over the 34
in
X.
The
answer.
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