The difference between 54 and 39 is: 
The difference between 90 and 18 is: 
The difference between 59 and 39 is: 
The difference between 54 and 33 is: 
The difference between 54 and 39 is: 
The difference between 54 and 39 is: 
The difference between 57 and 32 is: 
The difference between 54 and 39 is: 