The difference between 40 and 31 is: 
The difference between 25 and 19 is: 
The difference between 48 and 31 is: 
The difference between 40 and 30 is: 
The difference between 50 and 31 is: 
The difference between 40 and 11 is: 
The difference between 49 and 30 is: 
The difference between 40 and 31 is: 