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 is probably the easiest mental math technique used for squaring any whole numbers with just 1s. <br /> <br />11 x 11 <br />111 x 111 <br />1111 x 1111 <br />11111 x 11111
