The difference between 87 and 77 is: 
The difference between 72 and 18 is: 
The difference between 89 and 77 is: 
The difference between 87 and 72 is: 
The difference between 87 and 77 is: 
The difference between 87 and 77 is: 
The difference between 80 and 74 is: 
The difference between 87 and 77 is: 