The difference between 52 and 40 is: 
The difference between 78 and 34 is: 
The difference between 54 and 40 is: 
The difference between 52 and 40 is: 
The difference between 72 and 40 is: 
The difference between 52 and 10 is: 
The difference between 61 and 49 is: 
The difference between 52 and 40 is: 