The difference between 33 and 21 is: 
The difference between 41 and 15 is: 
The difference between 34 and 21 is: 
The difference between 33 and 20 is: 
The difference between 83 and 21 is: 
The difference between 33 and 21 is: 
The difference between 41 and 29 is: 
The difference between 33 and 21 is: 