The difference between 81 and 55 is: 
The difference between 60 and 21 is: 
The difference between 89 and 55 is: 
The difference between 81 and 50 is: 
The difference between 61 and 55 is: 
The difference between 81 and 35 is: 
The difference between 88 and 52 is: 
The difference between 81 and 55 is: 