The difference between 19 and 13 is: 
The difference between 24 and 15 is: 
The difference between 15 and 13 is: 
The difference between 19 and 17 is: 
The difference between 59 and 13 is: 
The difference between 19 and 13 is: 
The difference between 23 and 17 is: 
The difference between 19 and 13 is: 