The difference between 91 and 30 is: 
The difference between 81 and 68 is: 
The difference between 98 and 30 is: 
The difference between 91 and 30 is: 
The difference between 41 and 30 is: 
The difference between 91 and 30 is: 
The difference between 100 and 39 is: 
The difference between 91 and 30 is: 