The difference between 81 and 19 is: 
The difference between 75 and 56 is: 
The difference between 89 and 19 is: 
The difference between 81 and 10 is: 
The difference between 61 and 19 is: 
The difference between 81 and 29 is: 
The difference between 89 and 17 is: 
The difference between 81 and 19 is: 