The difference between 91 and 54 is: 
The difference between 86 and 21 is: 
The difference between 99 and 54 is: 
The difference between 91 and 50 is: 
The difference between 71 and 54 is: 
The difference between 91 and 34 is: 
The difference between 98 and 51 is: 
The difference between 91 and 54 is: 