The difference between 23 and 13 is: 
The difference between 93 and 36 is: 
The difference between 25 and 13 is: 
The difference between 23 and 12 is: 
The difference between 33 and 13 is: 
The difference between 23 and 13 is: 
The difference between 20 and 14 is: 
The difference between 23 and 13 is: 