The difference between 28 and 21 is: 
The difference between 92 and 24 is: 
The difference between 22 and 21 is: 
The difference between 28 and 22 is: 
The difference between 48 and 21 is: 
The difference between 28 and 11 is: 
The difference between 36 and 29 is: 
The difference between 28 and 21 is: 