The difference between 20 and 11 is: 
The difference between 36 and 19 is: 
The difference between 22 and 11 is: 
The difference between 20 and 10 is: 
The difference between 90 and 11 is: 
The difference between 20 and 11 is: 
The difference between 29 and 10 is: 
The difference between 20 and 11 is: 