The difference between 81 and 52 is: 
The difference between 91 and 73 is: 
The difference between 88 and 52 is: 
The difference between 81 and 50 is: 
The difference between 61 and 52 is: 
The difference between 81 and 12 is: 
The difference between 89 and 50 is: 
The difference between 81 and 52 is: 