The difference between 79 and 17 is: 
The difference between 43 and 16 is: 
The difference between 79 and 17 is: 
The difference between 79 and 18 is: 
The difference between 29 and 17 is: 
The difference between 79 and 47 is: 
The difference between 81 and 19 is: 
The difference between 79 and 17 is: 