The difference between 41 and 40 is: 
The difference between 43 and 15 is: 
The difference between 42 and 40 is: 
The difference between 41 and 40 is: 
The difference between 91 and 40 is: 
The difference between 41 and 10 is: 
The difference between 50 and 49 is: 
The difference between 41 and 40 is: 