The difference between 39 and 18 is: 
The difference between 33 and 15 is: 
The difference between 39 and 18 is: 
The difference between 39 and 14 is: 
The difference between 49 and 18 is: 
The difference between 39 and 28 is: 
The difference between 40 and 19 is: 
The difference between 39 and 18 is: 