The difference between 61 and 13 is: 
The difference between 56 and 14 is: 
The difference between 66 and 13 is: 
The difference between 61 and 10 is: 
The difference between 21 and 13 is: 
The difference between 61 and 33 is: 
The difference between 69 and 11 is: 
The difference between 61 and 13 is: 