The difference between 42 and 18 is: 
The difference between 90 and 89 is: 
The difference between 49 and 18 is: 
The difference between 42 and 10 is: 
The difference between 72 and 18 is: 
The difference between 42 and 38 is: 
The difference between 47 and 13 is: 
The difference between 42 and 18 is: 