The difference between 89 and 77 is: 
The difference between 57 and 16 is: 
The difference between 88 and 77 is: 
The difference between 89 and 74 is: 
The difference between 99 and 77 is: 
The difference between 89 and 17 is: 
The difference between 90 and 78 is: 
The difference between 89 and 77 is: 