The difference between 99 and 81 is: 
The difference between 77 and 71 is: 
The difference between 95 and 81 is: 
The difference between 99 and 82 is: 
The difference between 99 and 81 is: 
The difference between 99 and 41 is: 
The difference between 101 and 83 is: 
The difference between 99 and 81 is: 