The difference between 61 and 30 is: 
The difference between 82 and 18 is: 
The difference between 61 and 30 is: 
The difference between 61 and 30 is: 
The difference between 91 and 30 is: 
The difference between 61 and 50 is: 
The difference between 70 and 39 is: 
The difference between 61 and 30 is: 