The difference between 72 and 13 is: 
The difference between 86 and 40 is: 
The difference between 78 and 13 is: 
The difference between 72 and 10 is: 
The difference between 72 and 13 is: 
The difference between 72 and 63 is: 
The difference between 79 and 10 is: 
The difference between 72 and 13 is: 