The difference between 99 and 91 is: 
The difference between 55 and 29 is: 
The difference between 97 and 91 is: 
The difference between 99 and 95 is: 
The difference between 99 and 91 is: 
The difference between 99 and 11 is: 
The difference between 101 and 93 is: 
The difference between 99 and 91 is: 