The difference between 90 and 60 is: 
The difference between 80 and 54 is: 
The difference between 96 and 60 is: 
The difference between 90 and 60 is: 
The difference between 90 and 60 is: 
The difference between 90 and 30 is: 
The difference between 91 and 65 is: 
The difference between 90 and 60 is: 