The difference between 19 and 18 is: 
The difference between 56 and 39 is: 
The difference between 19 and 18 is: 
The difference between 19 and 11 is: 
The difference between 49 and 18 is: 
The difference between 19 and 18 is: 
The difference between 20 and 19 is: 
The difference between 19 and 18 is: 