The difference between 51 and 28 is: 
The difference between 87 and 57 is: 
The difference between 59 and 28 is: 
The difference between 51 and 20 is: 
The difference between 71 and 28 is: 
The difference between 51 and 28 is: 
The difference between 55 and 22 is: 
The difference between 51 and 28 is: 