The difference between 98 and 77 is: 
The difference between 79 and 39 is: 
The difference between 99 and 77 is: 
The difference between 98 and 73 is: 
The difference between 98 and 77 is: 
The difference between 98 and 47 is: 
The difference between 100 and 79 is: 
The difference between 98 and 77 is: 