Question

Find the cubes of the following number by column method 72 .

Answer 1

We have to find the cube of 72 using column method. We have:  \[a = 7 and b = 2\]

Column I a3	Column II   \[a = 7 \text{ and } b = 2\]	Column III   \[3 \times a \times b^2\]	Column IV b3
\[7^3 = 343\]	\[3 \times a^2 \times b = 3 \times 7^2 \times 2 = 294\]	\[3 \times a^2 \times b = 3 \times 7^2 \times 2 = 294\]	\[2^3 = 8\]
+30	+8	+0	8
373	302	84
373	2	4	8

 

 

 

Thus, cube of 72 is 373248.