Find the Cubes of the Following Number by Column Method 72 . - Mathematics

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Sum

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

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Solution

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.

 
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Chapter 4: Cubes and Cube Roots - Exercise 4.1 [Page 9]

APPEARS IN

RD Sharma Class 8 Maths
Chapter 4 Cubes and Cube Roots
Exercise 4.1 | Q 19.3 | Page 9

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