For more details go to www.abellna.com website. <br /> <br />A full mental math video may contain 2-8 examples. Only some examples are provided in a given video for demonstration purposes. <br /> <br />For example, find the square root of numbers such as 11, 22, 45, etc. The square roots of these types of numbers are decimal numbers. <br /> <br />A technique in the Mental Math: Unleash The Power e-book also exist for finding the square roots of single digit numbers (non-perfect square numbers) such as 5, 6, 8, etc.