https://www.youtube.com/watch?v=xkbQDEXJy2k >>> Doing The Math >>> http://www.youtube.com/watch?v=xkbQDEXJy2k http://www.youtube.com/watch?v=xkbQDEXJy2k this 7 x 13 = 28, after all https://www.youtube.com/watch?v=xkbQDEXJy2k https://www.youtube.com/watch?v=xkbQDEXJy2k http://www.youtube.com/watch?v=xkbQDEXJy2k