This rounding game is called "Rollin' Estimates." All you need is dice and the attached game board and you're ready to play! The students will roll three dice and build a number. Then they will round their number to the nearest hundred and write it in expanded form. This game can be changed to fit the needs of your learners. The students can build two/four digit numbers and round to the tens/thousands place. This would be a great guided math activity or center.