The difference between 22 and 21 is: 
The difference between 54 and 49 is: 
The difference between 26 and 21 is: 
The difference between 22 and 21 is: 
The difference between 72 and 21 is: 
The difference between 22 and 11 is: 
The difference between 30 and 29 is: 
The difference between 22 and 21 is: 