The difference between 30 and 10 is: 
The difference between 97 and 21 is: 
The difference between 36 and 10 is: 
The difference between 30 and 10 is: 
The difference between 80 and 10 is: 
The difference between 30 and 20 is: 
The difference between 37 and 18 is: 
The difference between 30 and 10 is: 