The difference between 91 and 87 is: 
The difference between 49 and 29 is: 
The difference between 99 and 87 is: 
The difference between 91 and 80 is: 
The difference between 91 and 87 is: 
The difference between 91 and 27 is: 
The difference between 97 and 83 is: 
The difference between 91 and 87 is: 