The difference between 81 and 33 is: 
The difference between 52 and 19 is: 
The difference between 84 and 33 is: 
The difference between 81 and 30 is: 
The difference between 81 and 33 is: 
The difference between 81 and 13 is: 
The difference between 88 and 30 is: 
The difference between 81 and 33 is: 