The difference between 98 and 17 is: 
The difference between 81 and 20 is: 
The difference between 99 and 17 is: 
The difference between 98 and 11 is: 
The difference between 28 and 17 is: 
The difference between 98 and 77 is: 
The difference between 100 and 19 is: 
The difference between 98 and 17 is: 