The difference between 48 and 31 is: 
The difference between 78 and 13 is: 
The difference between 49 and 31 is: 
The difference between 48 and 37 is: 
The difference between 78 and 31 is: 
The difference between 48 and 21 is: 
The difference between 52 and 35 is: 
The difference between 48 and 31 is: 