The difference between 57 and 21 is: 
The difference between 48 and 41 is: 
The difference between 52 and 21 is: 
The difference between 57 and 26 is: 
The difference between 87 and 21 is: 
The difference between 57 and 31 is: 
The difference between 64 and 28 is: 
The difference between 57 and 21 is: 