The difference between 78 and 60 is: 
The difference between 97 and 40 is: 
The difference between 72 and 60 is: 
The difference between 78 and 66 is: 
The difference between 98 and 60 is: 
The difference between 78 and 30 is: 
The difference between 87 and 69 is: 
The difference between 78 and 60 is: 