The difference between 51 and 23 is: 
The difference between 71 and 68 is: 
The difference between 56 and 23 is: 
The difference between 51 and 20 is: 
The difference between 71 and 23 is: 
The difference between 51 and 23 is: 
The difference between 58 and 20 is: 
The difference between 51 and 23 is: 