The difference between 81 and 69 is: 
The difference between 64 and 27 is: 
The difference between 89 and 69 is: 
The difference between 81 and 60 is: 
The difference between 71 and 69 is: 
The difference between 81 and 69 is: 
The difference between 87 and 65 is: 
The difference between 81 and 69 is: 