The difference between 89 and 87 is: 
The difference between 99 and 14 is: 
The difference between 88 and 87 is: 
The difference between 89 and 83 is: 
The difference between 99 and 87 is: 
The difference between 89 and 67 is: 
The difference between 90 and 88 is: 
The difference between 89 and 87 is: 