Question

The least number should be multiplied to 720 to become a perfect square number is …………………. 

A) 13 

B) 9 

C) 5 

D) 10

Answer 1

Correct option is  C) 5

Answer 2

Correct option is (C) 5

720 \(=9\times16\times5=3^2\times4^2\times5.\)

Since, factors 3 & 4 are in square but 5 is not in square.

\(\therefore\) We have to multiply 720 by 5 to get a perfect square number.