The difference between 29 and 21 is: 
The difference between 85 and 84 is: 
The difference between 25 and 21 is: 
The difference between 29 and 24 is: 
The difference between 89 and 21 is: 
The difference between 29 and 11 is: 
The difference between 36 and 28 is: 
The difference between 29 and 21 is: 