Advertisement
Short-cut multiplication
If
the multiplier
contains figures
of
a
higher value
than 5,
.for
example 8,
it
saves
time to
use
the
so-called
short-cut
multiplication
nrethod.
This is
performed
by
first'moving the
handle
t'rom
its
original position about an inch
in
the forward direction. You
then
bring
forth
the 8
by
making
two
backward turns. The multiplier
register
to
the
left of
the position indicator
will
then be
filled
by
nines.
In
order
to
remoye these nines
you
press
the
left
hand
shift key
!l
or..
and make
a
forward
turn (8
being
the
sanre
as
-2*
iO).
By
saving
all
the
turns
required
for
the
operation
in
the
normai way
of
multiplication you
will
effect a time-saving
of up
to
40
oloby
using short-cuts.
If,
instead,
you
move
the handle at
once
in
the negative direction,
there
will
appear
to
the righc
in
the multiplier register
a red
dot
which
indicates
that
the
register
is
set
for
minus
or
negative opera-
tion.
If
this
is the
case
you
will
have
to
clear the
rnultiplier
register
and
the
product
register
and repeat the
operatioir.
Example:
758X819
:
?
Sec
up
758
by
pressing
the setting keys. Move the handle about
an
inch
in
the forward direction and then make a negative turn, Thc
rnultiplier
register
will
show
a
row of
nines.
Press
the
ieft
hand shift key
!
and make
two forward
turns
so
that
a
figure
1 appears
in
the
muitiplier
register.
Press
the
left
hand
shift key
tf
and
make
two
backward
(nega-
tive)
turns,
3{}
XTK. E'
F
{
Advertisement
