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 and measure the line segment from Door A . Flip the three coins and do a look up in and measure the corresponding line segment in Door B . Add them together . 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] 
Measurement
Coin tosses (largest to smallest): TTT TTH THT THH HTT HTH HHT HHH
Segment length in Door A 3.5 cm 3.3 cm 1.4 cm 2.3 cm 4.6 cm 3.1 cm 3.9 cm 4.3 cm
Segment length in Door B 1.4 cm 2.3 cm 3.1 cm 3.3 cm 3.5 cm 3.9 cm 4.3 cm 4.6 cm

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