The difference between 90 and 11 is: 
The difference between 83 and 35 is: 
The difference between 93 and 11 is: 
The difference between 90 and 10 is: 
The difference between 40 and 11 is: 
The difference between 90 and 71 is: 
The difference between 99 and 10 is: 
The difference between 90 and 11 is: 