The difference between 78 and 28 is: 
The difference between 80 and 39 is: 
The difference between 79 and 28 is: 
The difference between 78 and 20 is: 
The difference between 88 and 28 is: 
The difference between 78 and 28 is: 
The difference between 70 and 21 is: 
The difference between 78 and 28 is: 