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

Sum

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

#### Solution

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

 Column Ia3 Column II   $a = 7 \text{ and } b = 2$ Column III   $3 \times a \times b^2$ Column IVb3 $7^3 = 343$ $3 \times a^2 \times b = 3 \times 7^2 \times 2 = 294$ $3 \times a^2 \times b = 3 \times 7^2 \times 2 = 294$ $2^3 = 8$ +30 +8 +0 8 373 302 84 373 2 4 8

Thus, cube of 72 is 373248.

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#### APPEARS IN

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