The difference between 18 and 18 is: 
The difference between 70 and 12 is: 
The difference between 19 and 18 is: 
The difference between 18 and 12 is: 
The difference between 58 and 18 is: 
The difference between 18 and 18 is: 
The difference between 10 and 11 is: 
The difference between 18 and 18 is: 