Question

The numbers having $1$ or $9$ in the units place, then its square ends with_______.

• A. $9$
• B. $0$
• C. $1$
• D. $6$

Answer 1

The correct option is C $1$

$9\times 9=8\underset{–}{1}$
$11\times 11=12\underset{–}{1}$ ......(last digit is $1$)
Therefore, option C is the correct answer.