Are you teaching triple digit expanded form? This activity is fun as a quick assessment or morning work, but can also be used as a game or a race.
Students roll a die 3 times (or 3 dice once) and write their number down. Then they write it in expanded form. I use this as morning work frequently, and as students have gotten faster at it, I've added more numbers.
Included are forms for 2, 3, and 4 digit numbers.