In class, the last 10 minutes or so is used to play this game. It gets increasingly challenging each time, as we are making bigger and bigger numbers. Each child gets a place value mat and I am in charge of the deck of cards (which includes the zero). As I draw each card, the students need to decide where to put that number - under the 10 thousands place, the tens place? Once they write a number down, they cannot erase it. We each try to get the largest number possible. This game takes knowledge of the place value system, strategy, and luck.
Then we practice reading our numbers. Currently we are practicing reading numbers into the millions place.