Question

Find perfect square numbers between $80$ & $90$.

• A. $80,84$
• B. Only $81$
• C. 86, 89
• D. None of the above

Answer 1

The correct option is B Only $81$

Only $81$ is a perfect square number between $80$ & $90$.

$9^2=81$,

${10}^2=100$, before its $8^2=64$ .

$(64,81,100$) only $81$ lies between $80$ & $90$.

Therefore, B is the correct answer.