The difference between 78 and 31 is: 
The difference between 43 and 39 is: 
The difference between 79 and 31 is: 
The difference between 78 and 36 is: 
The difference between 48 and 31 is: 
The difference between 78 and 21 is: 
The difference between 81 and 34 is: 
The difference between 78 and 31 is: 