The difference between 49 and 13 is: 
The difference between 75 and 31 is: 
The difference between 47 and 13 is: 
The difference between 49 and 17 is: 
The difference between 59 and 13 is: 
The difference between 49 and 23 is: 
The difference between 54 and 18 is: 
The difference between 49 and 13 is: 