The difference between 91 and 57 is: 
The difference between 42 and 41 is: 
The difference between 99 and 57 is: 
The difference between 91 and 50 is: 
The difference between 81 and 57 is: 
The difference between 91 and 57 is: 
The difference between 97 and 53 is: 
The difference between 91 and 57 is: 