Question

1,03,823 is a perfect cube. The units digit of cube root of 1,03,823 is ______.

• A. 3
• B. 5
• C. 7
• D. 9

Answer 1

The correct option is C 7

Given number is 1,03,823.

$\begin{array}{cc}\text{Units digit of}& \text{Units digit of}\\ \text{a number}& \text{of the cube}\\ 1& 1\\ 2& 8\\ 3& 7\\ 4& 4\\ 5& 5\\ 6& 6\\ 7& 3\\ 8& 2\\ 9& 9\end{array}$

From the table, we can see that if the units digit of a perfect cube ends with 3, then units digit of cube root of that number is 7.

$\therefore$ The units digit of cube root of 103,823 is 7.