Find the smallest number by which 720 should be multiplied so that the product becomes a perfect square.

Correct option is D

Given:

Number = 720

Concept Used:

To make a number a perfect square, all prime factors must have even powers.

Solution:

720 =$$2^4 \times 3^2 \times 5^1$$​​

​$$2^4$$​(even power)

​$$3^2$$​ (even power)

​$$5^1$$​ (odd power)

To make the power of 5 even, multiply by 5.

The smallest number to multiply 720 to make it a perfect square is 5.

Option (D) is right.