The difference between 28 and 25 is: 
The difference between 64 and 33 is: 
The difference between 29 and 25 is: 
The difference between 28 and 22 is: 
The difference between 68 and 25 is: 
The difference between 28 and 15 is: 
The difference between 30 and 27 is: 
The difference between 28 and 25 is: 