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 . Multiply 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. 
 vals[0] 
 DecimalMult 


 Coin tosses (largest to smallest):  TTT TTH THT THH HTT HTH HHT HHH


 Door A 0.2 0.02 2 0.04 0.4 4 0.05 0.5


 Door B 0.3 0.03 3 0.4 4 0.04 0.2 0.02

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

 vals[0] 
 DecimalMult 


 x 0.2 0.02 2 0.04 0.4 4 0.05 0.5


 0.3 0.06 0.006 0.6 0.012 0.12 1.2 0.015 0.15


 0.03 0.006 0.0006 0.06 0.0012 0.012 0.12 0.0015 0.015


 3 0.6 0.06 6 0.12 1.2 12 0.15 1.5


 0.4 0.08 0.008 0.8 0.016 0.16 1.6 0.02 0.2


 4 0.8 0.08 8 0.16 1.6 16 0.2 2


 0.04 0.008 0.0008 0.08 0.0016 0.016 0.16 0.002 0.02


 0.2 0.04 0.004 0.4 0.008 0.08 0.8 0.01 0.1


 0.02 0.004 0.0004 0.04 0.0008 0.008 0.08 0.001 0.01