The difference between 77 and 11 is: 
The difference between 88 and 83 is: 
The difference between 79 and 11 is: 
The difference between 77 and 16 is: 
The difference between 47 and 11 is: 
The difference between 77 and 21 is: 
The difference between 81 and 15 is: 
The difference between 77 and 11 is: 