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...  
 

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 compare 7/2 6/4 1/3 13/6 7/4 17/15 13/12 32/33


 3 1/2 3 1/2 = 3 1/2 3 1/2 > 1 1/2 3 1/2 > 1/3 3 1/2 > 2 1/6 3 1/2 > 1 3/4 3 1/2 > 1 2/15 3 1/2 > 1 1/12 3 1/2 > 32/33


 1 1/2 1 1/2 < 3 1/2 1 1/2 = 1 1/2 1 1/2 > 1/3 1 1/2 < 2 1/6 1 1/2 < 1 3/4 1 1/2 > 1 2/15 1 1/2 > 1 1/12 1 1/2 > 32/33


 1/3 1/3 < 3 1/2 1/3 < 1 1/2 1/3 = 1/3 1/3 < 2 1/6 1/3 < 1 3/4 1/3 < 1 2/15 1/3 < 1 1/12 1/3 < 32/33


 2 1/6 2 1/6 < 3 1/2 2 1/6 > 1 1/2 2 1/6 > 1/3 2 1/6 = 2 1/6 2 1/6 > 1 3/4 2 1/6 > 1 2/15 2 1/6 > 1 1/12 2 1/6 > 32/33


 1 3/4 1 3/4 < 3 1/2 1 3/4 > 1 1/2 1 3/4 > 1/3 1 3/4 < 2 1/6 1 3/4 = 1 3/4 1 3/4 > 1 2/15 1 3/4 > 1 1/12 1 3/4 > 32/33


 1 2/15 1 2/15 < 3 1/2 1 2/15 < 1 1/2 1 2/15 > 1/3 1 2/15 < 2 1/6 1 2/15 < 1 3/4 1 2/15 = 1 2/15 1 2/15 > 1 1/12 1 2/15 > 32/33


 1 1/12 1 1/12 < 3 1/2 1 1/12 < 1 1/2 1 1/12 > 1/3 1 1/12 < 2 1/6 1 1/12 < 1 3/4 1 1/12 < 1 2/15 1 1/12 = 1 1/12 1 1/12 > 32/33


 32/33 32/33 < 3 1/2 32/33 < 1 1/2 32/33 > 1/3 32/33 < 2 1/6 32/33 < 1 3/4 32/33 < 1 2/15 32/33 < 1 1/12 32/33 = 32/33