The difference between 91 and 49 is: 
The difference between 98 and 96 is: 
The difference between 99 and 49 is: 
The difference between 91 and 40 is: 
The difference between 71 and 49 is: 
The difference between 91 and 69 is: 
The difference between 95 and 43 is: 
The difference between 91 and 49 is: 