The difference between 68 and 67 is: 
The difference between 90 and 69 is: 
The difference between 69 and 67 is: 
The difference between 68 and 65 is: 
The difference between 88 and 67 is: 
The difference between 68 and 17 is: 
The difference between 70 and 69 is: 
The difference between 68 and 67 is: 