The difference between 43 and 31 is: 
The difference between 84 and 15 is: 
The difference between 44 and 31 is: 
The difference between 43 and 30 is: 
The difference between 73 and 31 is: 
The difference between 43 and 21 is: 
The difference between 51 and 39 is: 
The difference between 43 and 31 is: 