The difference between 71 and 50 is: 
The difference between 87 and 39 is: 
The difference between 73 and 50 is: 
The difference between 71 and 50 is: 
The difference between 71 and 50 is: 
The difference between 71 and 40 is: 
The difference between 80 and 59 is: 
The difference between 71 and 50 is: 