Question

Find the cube root of 300763 by finding it’s units and tens digit.

• A. 77
• B. 76
• C. 67
• D. 57

Answer 1

The correct option is C 67

The unit digit of the given number is 3.
$\therefore$ Unit digit of the cube root is 7.
Now let us strike out three digits from the right. We are left with the number 300.
Since, $6^3=216<300\text{and}{7}^3=343>300$
$\therefore$ Ten's digit is 6.
Thus, the required cube root is 67.
So, the option (3) is correct.