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 />This technique is specific to certain types of fractions. Using the lowest common denominator is not needed. <br /> <br />1/2 + 1/8 <br />1/7 + 1/15 <br />1/6 + 1/13 <br /> <br />Of course techniques for adding any type of fractions are also included in the Mental Math: Unleash The Power e-book. Some are provided in the video tutorials along with the local website.