The difference between 51 and 31 is: 
The difference between 70 and 45 is: 
The difference between 55 and 31 is: 
The difference between 51 and 30 is: 
The difference between 41 and 31 is: 
The difference between 51 and 11 is: 
The difference between 50 and 31 is: 
The difference between 51 and 31 is: 