The difference between 38 and 21 is: 
The difference between 92 and 68 is: 
The difference between 33 and 21 is: 
The difference between 38 and 21 is: 
The difference between 38 and 21 is: 
The difference between 38 and 21 is: 
The difference between 45 and 28 is: 
The difference between 38 and 21 is: 