The difference between 91 and 14 is: 
The difference between 99 and 15 is: 
The difference between 96 and 14 is: 
The difference between 91 and 10 is: 
The difference between 71 and 14 is: 
The difference between 91 and 34 is: 
The difference between 99 and 12 is: 
The difference between 91 and 14 is: 