The difference between 72 and 28 is: 
The difference between 23 and 17 is: 
The difference between 79 and 28 is: 
The difference between 72 and 20 is: 
The difference between 32 and 28 is: 
The difference between 72 and 38 is: 
The difference between 75 and 21 is: 
The difference between 72 and 28 is: 