The difference between 77 and 63 is: 
The difference between 71 and 48 is: 
The difference between 78 and 63 is: 
The difference between 77 and 65 is: 
The difference between 87 and 63 is: 
The difference between 77 and 23 is: 
The difference between 80 and 66 is: 
The difference between 77 and 63 is: 