The difference between 81 and 30 is: 
The difference between 93 and 70 is: 
The difference between 89 and 30 is: 
The difference between 81 and 30 is: 
The difference between 91 and 30 is: 
The difference between 81 and 30 is: 
The difference between 90 and 39 is: 
The difference between 81 and 30 is: 