The difference between 91 and 27 is: 
The difference between 66 and 47 is: 
The difference between 98 and 27 is: 
The difference between 91 and 20 is: 
The difference between 31 and 27 is: 
The difference between 91 and 57 is: 
The difference between 98 and 24 is: 
The difference between 91 and 27 is: 