The difference between 81 and 22 is: 
The difference between 90 and 42 is: 
The difference between 88 and 22 is: 
The difference between 81 and 20 is: 
The difference between 41 and 22 is: 
The difference between 81 and 12 is: 
The difference between 89 and 20 is: 
The difference between 81 and 22 is: 