The difference between 77 and 13 is: 
The difference between 53 and 18 is: 
The difference between 78 and 13 is: 
The difference between 77 and 12 is: 
The difference between 97 and 13 is: 
The difference between 77 and 23 is: 
The difference between 80 and 16 is: 
The difference between 77 and 13 is: 