Find the largest number of 2 digits which is a perfect square
Largest 2 digit number: 99
Square of 10 = 100 > 99 thus number would be less than 10.
Since we are asking for 2 digit number which is an integer then we consider only whole numbers thus, largest whole number less than 10 is 9.
9^2 = 81.
Hence largest two digit number who is also a perfect square = 81.