The difference between 30 and 13 is: 
The difference between 94 and 42 is: 
The difference between 38 and 13 is: 
The difference between 30 and 10 is: 
The difference between 40 and 13 is: 
The difference between 30 and 13 is: 
The difference between 39 and 12 is: 
The difference between 30 and 13 is: 