The difference between 72 and 23 is: 
The difference between 56 and 42 is: 
The difference between 74 and 23 is: 
The difference between 72 and 21 is: 
The difference between 92 and 23 is: 
The difference between 72 and 23 is: 
The difference between 79 and 20 is: 
The difference between 72 and 23 is: 