The difference between 39 and 27 is: 
The difference between 71 and 40 is: 
The difference between 39 and 27 is: 
The difference between 39 and 25 is: 
The difference between 79 and 27 is: 
The difference between 39 and 17 is: 
The difference between 40 and 28 is: 
The difference between 39 and 27 is: 