The difference between 30 and 21 is: 
The difference between 96 and 62 is: 
The difference between 36 and 21 is: 
The difference between 30 and 20 is: 
The difference between 70 and 21 is: 
The difference between 30 and 11 is: 
The difference between 39 and 20 is: 
The difference between 30 and 21 is: 