The difference between 80 and 50 is: 
The difference between 51 and 30 is: 
The difference between 88 and 50 is: 
The difference between 80 and 50 is: 
The difference between 80 and 50 is: 
The difference between 80 and 60 is: 
The difference between 81 and 59 is: 
The difference between 80 and 50 is: 