The difference between 54 and 42 is: 
The difference between 68 and 15 is: 
The difference between 57 and 42 is: 
The difference between 54 and 40 is: 
The difference between 84 and 42 is: 
The difference between 54 and 32 is: 
The difference between 61 and 49 is: 
The difference between 54 and 42 is: 