This game is intended to help students work on place value, comparing large numbers and rounding.
To play this game all you need is a deck of cards and this place value mat.
Players take turns drawing cards (face cards removed) and choosing a place for them on their place value mat. After each player has completed their number, they then fill in the rounding questions.
For each number that is rounded correctly, they receive 1 point. The player with the largest number of the round receives an additional point.
First player to reach 20 points wins.
For more details, see this post.