The difference between 28 and 27 is: 
The difference between 92 and 24 is: 
The difference between 28 and 27 is: 
The difference between 28 and 20 is: 
The difference between 78 and 27 is: 
The difference between 28 and 17 is: 
The difference between 30 and 29 is: 
The difference between 28 and 27 is: 