Question

What least number must be added to 521 to make it a perfect square? 

A. 3 

B. 4 

C. 5 

D. 8

Answer 1

For making 521 a perfect square, we have to add 8 on it as: 

521 + 8 = 529 

And we know that,

\(\sqrt{529}=23\)

Hence, option (D) is correct