Use a simple math tool, dice, to review how to write 3-digit numbers in expanded and standard form. As an extension you can also have students draw a quick picture of each number. You can have students place numbers in places in sequential order or as they roll, and have them try to make a larger number than their partner. Compare two numbers for review.
Tally sheet for two rounds is also included if you are going to have students compare numbers created.
Check out freebie 3-digit Draw-It for review of drawing quick pictures.