The difference between 42 and 23 is: 
The difference between 87 and 25 is: 
The difference between 45 and 23 is: 
The difference between 42 and 21 is: 
The difference between 82 and 23 is: 
The difference between 42 and 33 is: 
The difference between 49 and 20 is: 
The difference between 42 and 23 is: 