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 the Distance travelled . Flip the three coins and do a look up in the Time travelled . Determine the speed . 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] 
 Rates 


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


 Distance travelled 50 km 75 km 100 km 125 km 150 km 300 km 600  km 1000 km


 Time travelled 0.1 hours 0.25 hours 0.5 hours 1 hour 1.5 hours 3 hours 5 hours 10 hours

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