Express$64$ as the sum of $8$ odd numbers.

Express ${19}^2$ as the sum of two consecutive integers.

Express ${33}^2$ as the sum of two consecutive integers.

Express ${47}^2$ as the sum of two consecutive integers.

Find the square of $31$ without actual multiplication.

Find the square of $42$ without actual multiplication.

Find the squares of$86$without actual multiplication.

Find the squares of$94$ without actual multiplication.