The difference between 31 and 29 is: 
The difference between 20 and 10 is: 
The difference between 39 and 29 is: 
The difference between 31 and 20 is: 
The difference between 61 and 29 is: 
The difference between 31 and 29 is: 
The difference between 38 and 26 is: 
The difference between 31 and 29 is: 