The difference between 49 and 28 is: 
The difference between 90 and 44 is: 
The difference between 49 and 28 is: 
The difference between 49 and 21 is: 
The difference between 39 and 28 is: 
The difference between 49 and 28 is: 
The difference between 50 and 29 is: 
The difference between 49 and 28 is: 