The difference between 81 and 54 is: 
The difference between 71 and 42 is: 
The difference between 86 and 54 is: 
The difference between 81 and 50 is: 
The difference between 71 and 54 is: 
The difference between 81 and 44 is: 
The difference between 88 and 51 is: 
The difference between 81 and 54 is: 