The difference between 18 and 12 is: 
The difference between 90 and 41 is: 
The difference between 18 and 12 is: 
The difference between 18 and 13 is: 
The difference between 58 and 12 is: 
The difference between 18 and 12 is: 
The difference between 21 and 15 is: 
The difference between 18 and 12 is: 