The difference between 42 and 28 is: 
The difference between 78 and 71 is: 
The difference between 49 and 28 is: 
The difference between 42 and 20 is: 
The difference between 32 and 28 is: 
The difference between 42 and 18 is: 
The difference between 46 and 22 is: 
The difference between 42 and 28 is: 