The difference between 89 and 21 is: 
The difference between 24 and 20 is: 
The difference between 83 and 21 is: 
The difference between 89 and 28 is: 
The difference between 49 and 21 is: 
The difference between 89 and 21 is: 
The difference between 91 and 23 is: 
The difference between 89 and 21 is: 