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14. Square root extraction
Express
the approximate expression ofVR as follows:
VA
=
(N+R)xS
Steps:
(See
attached
table
on
page
31.)
1. Take
3
digits from the figures
counting
from
the
left
.
Determine Nt
which is the
nearest value
in
the
square
root
t
ab
le.
2. Divide
R
into groups of
two
digits each
coun
ting
from
the decimal
point.
When
the highest group consists of one
digit,
determine S
from
row
1
N
in
the tab le.
When it consists of two digits, determine S from row
10N
of the
table
.
3.
Calculate
(N
+
R)
x
S.
Ex.
vi
53987
1. From
the table on page 31,
N=542=54200
(to equalize the digits.)
2
Then
determine S=214768
from the row IN.
3. Calculate (54200
+
53987) x 214768
.
Steps
:
.--1.
2
3
4
5
6
7
8
9
I
Operation
Display
Note
I
CD
0
.
54200
§
53987
§
@
214768
§
0
0
54200
54200
53987
108187
108187
214768
23235105616
i
Tabulation
dial
I
@
lamp
on
I
Ans.
@
lamp off
Note:
Five
digits
counting fro
m
the
hig
er digit are
avai
lable.
The position of the decimal poin
t
is decided by dividing R
int
o
groups
of two
d
igits
each
counting
from
the
deci
mal
point
.
Tak
ing
J
53987
,for
exa
mple,
53987
is
div
ided
into three*
grou ps
(5! 39: 87)
counting from
th
e
decimal point
.
Th
e
deci
mal
po
int
of
the
answer, therefore
is
placed
between the
third" and
the
fourth digit counting from the left.
The answer
is
232.35.
25
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