The difference between 99 and 49 is: 
The difference between 54 and 17 is: 
The difference between 99 and 49 is: 
The difference between 99 and 45 is: 
The difference between 69 and 49 is: 
The difference between 99 and 79 is: 
The difference between 96 and 49 is: 
The difference between 99 and 49 is: 