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Rule
of
three
The rule
of
three
is the
narne
of
a calculating operation, which may
look
as
follows:
)5575Y
435
L,xatn\le: -
-
?
-
725
First you
set
up the
largest factor
of
thc dividend
(above
the
line)
preceded
by a
O,
thus 035875. The nought is introduced to keep
yotr
from
exceeding
the capacity
of
the machine.
Press
the
tabr.rlator
tl
.
It
will
be
seen
that
the position indicator is now
ser
to
the
extrernc
left in
the multiplier regisrer, and
consequently
you carry out
the
multiplication
by
the figures
435
in
the order they
appear, t'rom
let't to rigbt in
tbe
mwltiplier.
You
therefore
multiply
first by 4.
Then
press
.shift
key
tt
and
multiply by
3.Press
right
hand
once
more
and
multiply by
5.
The
multiplier
register
shows
To
tire
left in
the
product
regisrer,
you
no'\!, ger
which
is
your product.
Clear setting and
muitiplier
registers.
Set
up
725.
As thc
first
figurc
of
the divisor is
greater
than thc
first
figure
of
the
dividencl
one
nought
is
set
up
in
front of
the clivisor. This
rvill
givc
rirre
nrore
dccirlal in
the
answer.
'Ihe
nought
in front of
the
number
Press
the
tabulator
l!
and
carry
The
multiplier
register
records
the
answer
If
thc division is
uneven, there
rvill
be
than the
divisor
and
it will
be
shown
in
the
the right
hand
shift
key
If
15
not
necessary,
out thc division
ir.r
thc risual way.
a
reilainder
wJrich
is
lcss
product
register.
3:l
a
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