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15. Cubic root extract
ion
Express the approximate expression
of
VR
=
(2N
+
R) x S.
Steps
:
(See attached table on page 32 .)
1. Take 3 digits from the figures
counting
from the left.
Determine N, which is the nearest value in the Cubic Root Table on
page 32.
2.
Divide R into
groups of
three digits
each counting
from the decimal point.
Select S from row 1 N when the highest groups of figures
consists
of
one
digit,
row 10N in the case
of
two digits, and row lOON in the case of three digits.
3. Calculate (2N
+
R) x
S
Ex.
3..j53987
1. From the table on page 33, N=542=54200 (to
equalize
the digits)
2. Then determine
S=232744
from the row 10N.
3. Calculate (2
x
54200
+
53987) x 232744
Steps:
Operation
Display
Note
1
I
CD
0
2
0
0
Tabulation dial
3
2
2
4
@
2
@
lamp on
5
54200
54200
6
§
108400
@
lamp
off
7
53987
53987
8
§)
162387
9
0
162387
@
lamp
on
10
232744
232744
11
§)
37794599928
®
lamp off
Note
:
Six
digits from
the
top
are
available.
Positi on of the
decimal
point
is
decided by
dividing R
into
groups
of
three digits
counting from
the
decimal
point.
Take
V
53987
,for
example
,
53987
is
divided
into
tw~
groups (53;
9~7).
The
decimal point
of
the
answer,
th eref ore, must be placed between the 2nd and
the
3rd
digit
counting
from the left. Th
e
answer
is
37.7945
2
6
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