The difference between 31 and 12 is: 
The difference between 88 and 17 is: 
The difference between 36 and 12 is: 
The difference between 31 and 10 is: 
The difference between 91 and 12 is: 
The difference between 31 and 12 is: 
The difference between 39 and 10 is: 
The difference between 31 and 12 is: 