The difference between 51 and 39 is: 
The difference between 29 and 15 is: 
The difference between 59 and 39 is: 
The difference between 51 and 30 is: 
The difference between 41 and 39 is: 
The difference between 51 and 39 is: 
The difference between 53 and 31 is: 
The difference between 51 and 39 is: 