The difference between 80 and 20 is: 
The difference between 68 and 17 is: 
The difference between 82 and 20 is: 
The difference between 80 and 20 is: 
The difference between 90 and 20 is: 
The difference between 80 and 10 is: 
The difference between 81 and 23 is: 
The difference between 80 and 20 is: 