The difference between 82 and 81 is: 
The difference between 64 and 49 is: 
The difference between 89 and 81 is: 
The difference between 82 and 81 is: 
The difference between 92 and 81 is: 
The difference between 82 and 31 is: 
The difference between 90 and 89 is: 
The difference between 82 and 81 is: 