The difference between 81 and 49 is: 
The difference between 96 and 80 is: 
The difference between 89 and 49 is: 
The difference between 81 and 40 is: 
The difference between 71 and 49 is: 
The difference between 81 and 39 is: 
The difference between 87 and 45 is: 
The difference between 81 and 49 is: 