The difference between 40 and 28 is: 
The difference between 65 and 48 is: 
The difference between 49 and 28 is: 
The difference between 40 and 20 is: 
The difference between 50 and 28 is: 
The difference between 40 and 18 is: 
The difference between 43 and 21 is: 
The difference between 40 and 28 is: 