The difference between 54 and 21 is: 
The difference between 99 and 92 is: 
The difference between 57 and 21 is: 
The difference between 54 and 20 is: 
The difference between 74 and 21 is: 
The difference between 54 and 11 is: 
The difference between 61 and 28 is: 
The difference between 54 and 21 is: 