The difference between 91 and 31 is: 
The difference between 68 and 26 is: 
The difference between 98 and 31 is: 
The difference between 91 and 30 is: 
The difference between 71 and 31 is: 
The difference between 91 and 31 is: 
The difference between 92 and 36 is: 
The difference between 91 and 31 is: 