The difference between 72 and 51 is: 
The difference between 56 and 18 is: 
The difference between 75 and 51 is: 
The difference between 72 and 50 is: 
The difference between 62 and 51 is: 
The difference between 72 and 41 is: 
The difference between 80 and 59 is: 
The difference between 72 and 51 is: 