The difference between 81 and 31 is: 
The difference between 38 and 14 is: 
The difference between 85 and 31 is: 
The difference between 81 and 30 is: 
The difference between 51 and 31 is: 
The difference between 81 and 21 is: 
The difference between 81 and 32 is: 
The difference between 81 and 31 is: 