Perfect Squares and Their Roots
How could a number be a perfect square? If you can arrange that number of items into a perfect square. Take 9 for example. You can take nine items and arrange them in a three by three square, so nine is a square number.
Take the list of whole numbers (0,1,2,3...) and square them, raise them to the second power, and you'll get a very special list of numbers known as the perfect squares. Knowing your perfect squares and their inverses, the square roots, will assist you in all types of problems- from arithmetic to algebra to geometry.
Watch the Virtual GED Class video for a complete explanation and tons of worked example problems.
A mix of perfect squares and their roots, round perfect squares and their roots, and estimation problems. See examples #3-7 below.