The difference between 71 and 39 is: 
The difference between 81 and 63 is: 
The difference between 79 and 39 is: 
The difference between 71 and 30 is: 
The difference between 51 and 39 is: 
The difference between 71 and 49 is: 
The difference between 74 and 32 is: 
The difference between 71 and 39 is: 