The difference between 66 and 65 is: 
The difference between 99 and 88 is: 
The difference between 67 and 65 is: 
The difference between 66 and 64 is: 
The difference between 96 and 65 is: 
The difference between 66 and 15 is: 
The difference between 70 and 69 is: 
The difference between 66 and 65 is: 