The difference between 77 and 21 is: 
The difference between 85 and 41 is: 
The difference between 76 and 21 is: 
The difference between 77 and 23 is: 
The difference between 97 and 21 is: 
The difference between 77 and 41 is: 
The difference between 81 and 25 is: 
The difference between 77 and 21 is: 