I saw this one here on PT- and my 5th & 6th graders loved it. Bring me the oreos and tell him thanks! (billions, millions, thousands, ones, decimal point, tenths, hundredths, thousandths.

Also, my students play this game. I have 9-sided dice they use instead of cards. I made my own place value mats to go along with it- I put them in sleeves and the kids use dry erase markers.

http://www.educationworld.com/a_less...xcars006.shtml
I've never gotten through the first unit in math so quickly. These two activities helped so much.