Take 10 blank index cards and divide them into 2 piles of 5 cards each.
Convert 5 large numbers into Roman numerals (an example would be: 448 = CDXLVIII).
Write one of these Roman numerals on each of the 5 index cards in the first pile (write only the Roman numeral). Duplicate these Roman numerals onto the cards in the second pile. Now, you should have 2 identical piles of Roman numeral cards. Place each pile in a sealed envelope.
Divide the guests into 2 teams.Give each team an envelope filled with Roman numeral index cards.Ask the team not to open their envelope until given the go-ahead.
The object of the game is to see which team can correctly convert their pile of cards first.
