Question

By what least number should 720 be multiplied so that the resulting number is a perfect square.

Answer 1

Here your answer ✍️

By Prime Factorisation
720=2×2×2×2×5×3×3

Make Pair Of numbers
Pairing(2×2)=2
Pairing (2×2)=2
Pairing(3×3)=3
Pairing(5×?)=5

So we have to Multiply By 1 more 5 to get perfect square

So Multiply 720×5
720×5=3600


And 3600 is Square root of =60

YOUR ANSWER=5