The difference between 16 and 15 is: 
The difference between 79 and 46 is: 
The difference between 18 and 15 is: 
The difference between 16 and 14 is: 
The difference between 86 and 15 is: 
The difference between 16 and 15 is: 
The difference between 20 and 19 is: 
The difference between 16 and 15 is: 