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 fraction in Door A . Flip the three coins and do a look up in a fraction in Door B . Add them . 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  
 
       
 
 
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 Door B  
 
       
 
 
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  On a different page so the players have to turn to it...  
 

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