The difference between 31 and 25 is: 
The difference between 64 and 56 is: 
The difference between 37 and 25 is: 
The difference between 31 and 20 is: 
The difference between 61 and 25 is: 
The difference between 31 and 25 is: 
The difference between 38 and 22 is: 
The difference between 31 and 25 is: 