The difference between 84 and 66 is: 
The difference between 42 and 23 is: 
The difference between 87 and 66 is: 
The difference between 84 and 62 is: 
The difference between 84 and 66 is: 
The difference between 84 and 16 is: 
The difference between 88 and 60 is: 
The difference between 84 and 66 is: 