The difference between 99 and 77 is: 
The difference between 90 and 58 is: 
The difference between 99 and 77 is: 
The difference between 99 and 77 is: 
The difference between 89 and 77 is: 
The difference between 99 and 27 is: 
The difference between 101 and 79 is: 
The difference between 99 and 77 is: 