The difference between 87 and 81 is: 
The difference between 98 and 45 is: 
The difference between 83 and 81 is: 
The difference between 87 and 86 is: 
The difference between 97 and 81 is: 
The difference between 87 and 31 is: 
The difference between 90 and 84 is: 
The difference between 87 and 81 is: 