The difference between 31 and 17 is: 
The difference between 70 and 59 is: 
The difference between 39 and 17 is: 
The difference between 31 and 10 is: 
The difference between 91 and 17 is: 
The difference between 31 and 17 is: 
The difference between 37 and 13 is: 
The difference between 31 and 17 is: 