Build-a-Number: Expanded Form Group Activity with Dice Get your students moving, collaborating, and thinking place value!This hands-on, whole-class math activity turns expanded form into an engaging game. Students each hold a color-coded die labeled with different place value numbers (ones, tens, hundreds, thousands). When the teacher calls out a number, like 5,139, students race to find their matching part (e.g., 5,000 • 100 • 30 • 9) and physically arrange themselves in expanded form. It’s