The difference between 38 and 31 is: 
The difference between 66 and 20 is: 
The difference between 37 and 31 is: 
The difference between 38 and 33 is: 
The difference between 68 and 31 is: 
The difference between 38 and 11 is: 
The difference between 43 and 36 is: 
The difference between 38 and 31 is: 