The difference between 52 and 51 is: 
The difference between 81 and 12 is: 
The difference between 57 and 51 is: 
The difference between 52 and 50 is: 
The difference between 72 and 51 is: 
The difference between 52 and 11 is: 
The difference between 60 and 59 is: 
The difference between 52 and 51 is: 