The difference between 81 and 73 is: 
The difference between 60 and 37 is: 
The difference between 85 and 73 is: 
The difference between 81 and 70 is: 
The difference between 91 and 73 is: 
The difference between 81 and 33 is: 
The difference between 89 and 71 is: 
The difference between 81 and 73 is: 