Question

A number ending in $9$ will have the unit's place of its square as:

• A. $3$
• B. $9$
• C. $1$
• D. $6$

Answer 1

The correct option is C

$1$

Step 1: Explanation of the correct option

We know that if a number has $9$ in its unit's place, then its square ends in $1$.

For example: $9\times 9=81$

$19\times 19=361$

Therefore option (B) is correct.

Step 2: Explanation of the incorrect option

Options (A), (C), and (D) do not give the correct answer.