Question

Using the property of square numbers, find which number is a perfect square?

• A. $81,121$
• B. $24,35$
• C. $99,101$
• D. $63,84$

Answer 1

Answer: (A)

$81,121$

$9\times 9=8\underset{–}{1}$

$11\times 11=12\underset{–}{1}$ ( last digit is $1$)

Therefore, A is the correct answer.