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

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

Solution:

The first three digit number (100) is a perfect square. Its square root is 10.

The number before 10 is 9.

Square of $9=(9)^{2}=81$

Thus, the largest 2 digit number that is a perfect square is 81 .

 

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