The McGraw Hill 6th grade book series of games.
Instructions:
Find three coins of different sizes (e.g. quarter, nickle, penny). Flip each and record the head/tail value. Look up a number in Door A . Flip the three coins and do a look up in a number in Door B . Figure out which one is bigger of whether they are equal . Your opponent may challenge you. Look up the answer in the table on the next page. If you are right and your opponent didn't challenge you, you get a point. If you are right and your opponent did challenge you, you get two points. If you are wrong and your opponent challenged you, your opponent gets a point. If you are wrong and your opponent didn't challenge you, nobody gets a point. Your opponent plays next.
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Coin tosses (largest to smallest): TTT TTH THT THH HTT HTH HHT HHH
Door A 7/2 6/4 1/3 13/6 7/4 17/15 13/12 32/33
Door B 3 1/2 1 1/2 1/3 2 1/6 1 3/4 1 2/15 1 1/12 32/33

On a different page so the players have to turn to it...