The difference between 80 and 80 is: 
The difference between 69 and 68 is: 
The difference between 83 and 80 is: 
The difference between 80 and 80 is: 
The difference between 90 and 80 is: 
The difference between 80 and 20 is: 
The difference between 84 and 85 is: 
The difference between 80 and 80 is: 