How to find square of a number easily

How to find the square of a trinomial.

Find the greatest number of five digits which is a perfect square. Also find the square root of the number of obtained.

Find the squares of the number127

Find the average of squares of first 10 numbers.

The difference between the squares of two numbers is 120. The square of the smaller number is twice the greater number. Find the numbers.

The sum of the squares of two positive integers is 208. If the square of the larger number is 18 xx the smaller number,find the numbers.

Algorithm to find the square root of a positive real number