The difference between 97 and 49 is: 
The difference between 77 and 52 is: 
The difference between 99 and 49 is: 
The difference between 97 and 43 is: 
The difference between 87 and 49 is: 
The difference between 97 and 19 is: 
The difference between 99 and 41 is: 
The difference between 97 and 49 is: 