The difference between 30 and 12 is: 
The difference between 70 and 33 is: 
The difference between 34 and 12 is: 
The difference between 30 and 10 is: 
The difference between 20 and 12 is: 
The difference between 30 and 22 is: 
The difference between 39 and 11 is: 
The difference between 30 and 12 is: 