The difference between 99 and 11 is: 
The difference between 67 and 28 is: 
The difference between 98 and 11 is: 
The difference between 99 and 13 is: 
The difference between 49 and 11 is: 
The difference between 99 and 81 is: 
The difference between 103 and 15 is: 
The difference between 99 and 11 is: 