The difference between 18 and 15 is: 
The difference between 99 and 38 is: 
The difference between 17 and 15 is: 
The difference between 18 and 17 is: 
The difference between 48 and 15 is: 
The difference between 18 and 15 is: 
The difference between 22 and 19 is: 
The difference between 18 and 15 is: 