The difference between 91 and 28 is: 
The difference between 87 and 82 is: 
The difference between 99 and 28 is: 
The difference between 91 and 20 is: 
The difference between 61 and 28 is: 
The difference between 91 and 18 is: 
The difference between 98 and 25 is: 
The difference between 91 and 28 is: 