The difference between 66 and 33 is: 
The difference between 93 and 77 is: 
The difference between 66 and 33 is: 
The difference between 66 and 31 is: 
The difference between 56 and 33 is: 
The difference between 66 and 13 is: 
The difference between 72 and 39 is: 
The difference between 66 and 33 is: 