Find the largest number of 2 digits which is a perfect square.

Question

Philoid · Accepted Answer

Let us take the first 3-digit number

First 3-digit number = 100

Now,

We know that,

100 is a perfect square.

And,

Its square root is 10.

Now,

The number before 10 is 9.

Square of 9 = 81

Hence,

The largest 2-digit number which is a perfect square is 81.