The difference between 61 and 39 is: 
The difference between 81 and 54 is: 
The difference between 69 and 39 is: 
The difference between 61 and 30 is: 
The difference between 91 and 39 is: 
The difference between 61 and 19 is: 
The difference between 64 and 32 is: 
The difference between 61 and 39 is: 