Discovered Pages
[Discover] BBC - Skillswise Numbers - Mental multiplication game http://www.bbc.co.uk/skillswise/numbers/wholenumbers/multiplication/mental/game.shtml
(smartboard games mentalmath interactive) 
[Discover] Odd Line: 9 Mental Math Tricks http://oddline.blogspot.com/2008/09/9-mental-math-tricks.html (mathematics tips mentalmath tricks)