Kids now days are incredibly fortunate to have computers and the World Wide Web......not for things like facebook, twitter, and email....but as valuable tools for Learning.
http://www.funbrain.com/, www.playkidsgames.com/mathGames.htm, and http://www.mathplayground.com/. Catholic grade school didn't afford us kids "fun" venues for learning our arithmetic, as it was called back then. We were either good at our numbers and praised, or we faltered and lagged behind with no special help or outside resources whatsoever.
My final word on math is simple and concise. Mickey Mouse and I think with the same side of our brains. Both of us are tickled pink to be able to count to 20 without taking our shoes off!