The difference between 66 and 66 is: 
The difference between 78 and 36 is: 
The difference between 69 and 66 is: 
The difference between 66 and 64 is: 
The difference between 76 and 66 is: 
The difference between 66 and 16 is: 
The difference between 63 and 64 is: 
The difference between 66 and 66 is: 