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Find the cubes of the following numbers by column method :
(i) 35
(ii) 56
(iii) 72.
To do:
We have to find the cube of the given numbers by the column method.
Solution:
(i)
I COLUMN | II COLUMN | III COLUMN | IV COLUMN |
$a^3$ | $3\times(a^2)\times(b)$ | $3\times(a)\times(b^2)$ | $b^3$ |
$3^3$ | $3\times(3^2)\times(5)$ | $3\times3\times(5^2)$ | $(5^3)$ |
$=27$ | $=135$ | $=225$ | $=125$ |
$+15$ | $+23$ | $+12$ | |
$42$ | $158$ | $237$ | |
$42$ | $8$ | $7$ | $5$ |
Therefore,
$(35)^3=42875$
(ii)
I COLUMN | II COLUMN | II COLUMN | IV COLUMN |
$a^3$ | $3\times(a^2)\times(b)$ | $3\times(a)\times(b^2)$ | $b^3$ |
$5^3$ | $3\times(5^2)\times(6)$ | $3\times5\times(6^2)$ | $(6^3)$ |
$=125$ | $=450$ | $=540$ | $216$ |
$+50$ | $+56$ | $+21$ | |
$175$ | $506$ | $561$ | |
$175$ | $6$ | $1$ | $6$ |
Therefore,
$(56)^3=175616$
(iii)
I COLUMN | II COLUMN | II COLUMN | IV COLUMN |
$a^3$ | $3\times(a^2)\times(b)$ | $3\times(a)\times(b^2)$ | $b^3$ |
$7^3$ | $3\times(7^2)\times(2)$ | $3\times7\times(2^2)$ | $(2^3)$ |
$=343$ | $=294$ | $=84$ | $8$ |
$+30$ | $+8$ | ||
$373$ | $302$ | ||
$373$ | $2$ | $4$ | $8$ |
Therefore,
$(72)^3=373248$
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