The difference between 81 and 45 is: 
The difference between 78 and 73 is: 
The difference between 89 and 45 is: 
The difference between 81 and 40 is: 
The difference between 91 and 45 is: 
The difference between 81 and 35 is: 
The difference between 87 and 41 is: 
The difference between 81 and 45 is: 