Find the squares of $42$ using the column method.

Find the squares of $29$ using the column method.

Find the square $76$ using the column method

Find the squares of $97$ using the observation method.

Find the square of $402$ using the observation method:

Find the squares $105$ using the observation method:

Find the square of $98$ using the observation method:

Find the square of $308$ using the observation method:

Find the squares of $27$ using the diagonal method.