A genuine mathematical trick, with explanation of the inner workings,&nbsp;<br /><br />Enjoy and try it on your friends and family <img src="https://e.deviantart.net/emoticons/s/smile.gif" width="15" height="15" alt=":)" data-embed-type="emoticon" data-embed-id="391" title=":) (Smile)"/><br /><br />Vaughan