The difference between 80 and 61 is: 
The difference between 70 and 40 is: 
The difference between 89 and 61 is: 
The difference between 80 and 60 is: 
The difference between 90 and 61 is: 
The difference between 80 and 71 is: 
The difference between 89 and 60 is: 
The difference between 80 and 61 is: 