You need at least 20 cards to play which you divide into 2 piles face down: an Easy and a Hard pile. Draw a race track on the board of about 30 squares in length to the end and divide the class into two teams. Pick a student and ask if they would like an easy or a hard card, also ask how many points they would like to wager on knowing the answer:

Easy 1-3 and Hard 4-6.

This done, show them the card which they must say. If they are correct move their team forward the amount of points bet, if wrong then move their team back that many points.