The difference between 77 and 23 is: 
The difference between 44 and 20 is: 
The difference between 77 and 23 is: 
The difference between 77 and 26 is: 
The difference between 37 and 23 is: 
The difference between 77 and 13 is: 
The difference between 82 and 28 is: 
The difference between 77 and 23 is: 