The difference between 61 and 17 is: 
The difference between 81 and 23 is: 
The difference between 68 and 17 is: 
The difference between 61 and 10 is: 
The difference between 31 and 17 is: 
The difference between 61 and 57 is: 
The difference between 64 and 10 is: 
The difference between 61 and 17 is: 